diff --git a/config.example.toml b/config.example.toml
index bd34eba8..0140e584 100644
--- a/config.example.toml
+++ b/config.example.toml
@@ -10,6 +10,7 @@ updates = ['C:\Games\TotK\update-1.4.3.nsp']
 keys = 'C:\Switch\prod.keys'
 # Optional: a firmware NCA directory (an unpacked firmware, or an emulator's installed registered/ directory).
 # tools/extract_fonts.py takes the system shared fonts from it; the game needs them only with Chinese or Korean text.
+# The installer asks for the same folder (--firmware) when the language needs those fonts.
 # firmware = 'C:\Switch\firmware'
 
 [work]
diff --git a/docs/installer.md b/docs/installer.md
index 304e239c..54d2fe6e 100644
--- a/docs/installer.md
+++ b/docs/installer.md
@@ -11,6 +11,8 @@ holds only the game; the installer and its tools stay outside it.
 2. Picks:
    - the base game (XCI or NSP) and the 1.2.1 or 1.4.3 update (NSP);
    - their `prod.keys`;
+   - optionally the firmware folder (`system/Contents/registered` of an unpacked firmware or an emulator's install),
+     needed for Chinese, Korean and Traditional Chinese text;
    - the game language and the install folder.
 3. Waits for the setup, one time. The window shows each step and its progress.
 4. Plays `totk.exe` from the install folder. The installer and the source NSP or XCI can be deleted.
@@ -22,6 +24,7 @@ The install folder (`main.c` `portable_paths()` reads this layout; it stays port
   totk.exe, SDL3.dll, libopus-0.dll, totk_xlate.exe
   totk.ini                       language; the other keys as commented defaults (totk.ini.example)
   exefs/, romfs/                 extracted from the player's files
+  shared-fonts/                  the Switch system fonts, with Chinese, Korean or Traditional Chinese text
   profile/                       saves
   logs/                          totk.log of the last run, totk.1.log to totk.4.log of the runs before it
   shader and pipeline caches     prepared by the setup; shader-cache/shader-cache.pack holds the translations
@@ -31,8 +34,8 @@ The install folder (`main.c` `portable_paths()` reads this layout; it stays port
 ## Updating the port
 
 The player runs a newer installer on the same folder. It reads `totk-install.json`, keeps `romfs/`, `exefs/`,
-`profile/` and `totk.ini` after checking their hashes, rebuilds `totk.exe` and re-prepares the shaders. A newer
-release that changes nothing game-derived skips the rebuild.
+`shared-fonts/`, `profile/` and `totk.ini` after checking their hashes, rebuilds `totk.exe` and re-prepares the
+shaders. A newer release that changes nothing game-derived skips the rebuild.
 
 Given an update file other than the recorded one (1.2.1, then 1.4.3), the installer extracts and builds again from it and
 keeps `profile/`. Saves carry over both ways: 1.4.3 converts a 1.2.1 save on load, and 1.2.1 loads the saves 1.4.3 wrote.
@@ -43,19 +46,22 @@ keeps `profile/`. Saves carry over both ways: 1.4.3 converts a 1.2.1 save on loa
    `tools/extract.py`), the keys are new enough for the update, enough space is free on the target disk (about 36 GiB at the peak of a
    first install, 20 GiB after it), the CPU has
    AVX2 (`-march=x86-64-v3`), a Vulkan 1.3 GPU exists. Each failure is one clear message.
-2. **Extract** ExeFS and RomFS into the install folder and verify the hashes.
-3. **Lift** the ExeFS to C (`recomp/gen.py`, `recomp/patches-v121.txt` or `patches-v143.txt`) into a temp folder next
+2. **Fonts** with Chinese, Korean or Traditional Chinese text and a firmware folder: extract the Switch system fonts
+   from the firmware into `shared-fonts/` (MacNativeGames' `extract_shared_fonts.py`, which verifies every NCA layer
+   and BFTTF header). Without a firmware folder the setup warns and goes on; the game then lacks those glyphs.
+3. **Extract** ExeFS and RomFS into the install folder and verify the hashes.
+4. **Lift** the ExeFS to C (`recomp/gen.py`, `recomp/patches-v121.txt` or `patches-v143.txt`) into a temp folder next
    to the installer.
-4. **Compile** the generated C, `modules.c`, `romfs.c`, `patches.c` and `ov_zstd.c` (they bake the per-install layout, RomFS
+5. **Compile** the generated C, `modules.c`, `romfs.c`, `patches.c` and `ov_zstd.c` (they bake the per-install layout, RomFS
    hashes and the game version's patch page) and link
    them with the prebuilt runtime library into `totk.exe` (`build_game.py --runtime-lib`; about 3 min on 24 cores).
-5. **Prepare** the RomFS patches and the shaders (`tools/make_romfs_patches.py`, `tools/prepare_shaders.py`,
+6. **Prepare** the RomFS patches and the shaders (`tools/make_romfs_patches.py`, `tools/prepare_shaders.py`,
    `totk.exe --prepare-shaders`) in the install folder, then fold the shader cache's loose files (four per shader, about
    117,000) into `shader-cache/shader-cache.pack` (`tools/pack_shader_cache.py`). totk.exe reads the pack first and
    writes the translations it makes in play as loose files; running the tool again with the game closed folds those in.
    The patches are written twice: `romfs-patches` and `romfs-patches-xbox` (`--xbox-prompts`, the A/B and X/Y prompts
    swapped for `pad_layout = xbox_prompts`).
-6. **Clean up** the temp folder (generated C and objects, about 1.3 GB).
+7. **Clean up** the temp folder (generated C and objects, about 1.3 GB).
 
 A cancelled or failed setup resumes from the last finished step (`totk-install.json`).
 
@@ -64,10 +70,13 @@ A cancelled or failed setup resumes from the last finished step (`totk-install.j
 `installer/` (stdlib only; `installer/layout.py` maps the release folder and, in a repository, the dev toolchain):
 
 ```
-python -m installer --base FILE --update FILE --keys FILE --lang CODE --dest DIR [--root DIR] [--temp DIR] [--verify]
+python -m installer --base FILE --update FILE --keys FILE --lang CODE --dest DIR [--firmware DIR] [--root DIR] [--temp DIR] [--verify]
 ```
 
 - On a folder with `totk-install.json` only `--dest` is needed; the game files only when the extraction must run again.
+- `--firmware DIR` is the folder holding the firmware NCAs: an unpacked firmware, or the emulators' installed
+  `Contents/registered` (the parent `Contents` folder works too). It is read only with Chinese, Korean or Traditional
+  Chinese text, and only when `shared-fonts/` is not already in the install folder.
 - stdout: one JSON event per line, types `start`, `plan`, `step` (started, done, skipped), `progress` (step, phase,
   done/total/unit), `space` (bytes needed and free on the install disk and the temp disk), `warning`, `error`, `end` (`installer/events.py`). Messages are ids with parameters;
   `installer/text/en.json` holds their English text. The human-readable log goes to `<temp>/logs/`.
diff --git a/installer/__init__.py b/installer/__init__.py
index 7c523f73..25092d16 100644
--- a/installer/__init__.py
+++ b/installer/__init__.py
@@ -1,9 +1,10 @@
 """The TotK installer: builds a playable folder from the player's own game files (docs/installer.md).
 
-    python -m installer --base FILE --update FILE --keys FILE --lang CODE --dest DIR [--root DIR] [--temp DIR]
+    python -m installer --base FILE --update FILE --keys FILE --lang CODE --dest DIR [--firmware DIR] [--root DIR]
+                        [--temp DIR]
 
 Modules: layout (where the bundled tools are, release or repository), events (JSON progress on stdout and the log
-file), state (totk-install.json), runner (which steps run: resume and update), steps (the six steps), ini (totk.ini),
+file), state (totk-install.json), runner (which steps run: resume and update), steps (the seven steps), ini (totk.ini),
 cli (the command line). text/en.json holds the English text of every message id the events carry.
 
 Standard library only, apart from what the extraction tools import (cryptography). Runs on Python 3.14.
diff --git a/installer/cli.py b/installer/cli.py
index 538f49d1..17e6da64 100644
--- a/installer/cli.py
+++ b/installer/cli.py
@@ -1,10 +1,12 @@
-"""Command line: python -m installer --base FILE --update FILE --keys FILE --lang CODE --dest DIR [--root DIR]
-                                     [--temp DIR] [--verify]
+"""Command line: python -m installer --base FILE --update FILE --keys FILE --lang CODE --dest DIR [--firmware DIR]
+                                     [--root DIR] [--temp DIR] [--verify]
 
-A first install needs every option. On a folder with totk-install.json (resume after a cancel or failure, or update
-with a newer release) only --dest is needed: --lang defaults to the recorded language, and the game files are needed
-only when the extraction has to run again. Prints JSON events on stdout (events.py). Exit code: 0 done, 1 failed,
-2 bad command line, 3 cancelled (Ctrl+C or Ctrl+Break).
+A first install needs every option. --firmware names the Switch firmware folder (an unpacked firmware or an emulator's
+Contents/registered); the setup extracts the system shared fonts from it when the language is Chinese, Korean or
+Traditional Chinese. On a folder with totk-install.json (resume after a cancel or failure, or update with a newer
+release) only --dest is needed: --lang defaults to the recorded language, and the game files are needed only when the
+extraction has to run again. Prints JSON events on stdout (events.py). Exit code: 0 done, 1 failed, 2 bad command
+line, 3 cancelled (Ctrl+C or Ctrl+Break).
 """
 import argparse
 import hashlib
@@ -48,6 +50,8 @@ def main(argv=None):
     ap.add_argument('--base', type=Path, help='base game, XCI or NSP')
     ap.add_argument('--update', type=Path, help='the update NSP: 1.1.1, 1.2.1 or 1.4.3')
     ap.add_argument('--keys', type=Path, help='prod.keys')
+    ap.add_argument('--firmware', type=Path, help='Switch firmware folder (Contents/registered) for the shared fonts '
+                                                   'of Chinese, Korean and Traditional Chinese text')
     ap.add_argument('--lang', help='game language, a Switch language code (en-US, en-GB, ja, de, ru, ...)')
     ap.add_argument('--dest', type=Path, required=True, help='install folder')
     ap.add_argument('--root', type=Path, help='release folder or repository (default: the folder above installer/)')
diff --git a/installer/gui.py b/installer/gui.py
index cd94fcde..375d2941 100644
--- a/installer/gui.py
+++ b/installer/gui.py
@@ -1,8 +1,9 @@
 """The installer window: python -m installer.gui
 
-A front end over the CLI (docs/installer.md): it collects the game files, the keys file path, the game language and the
-install folder, runs `python -m installer ...` as a subprocess and shows its JSON events. Decisions live in guilogic.py;
-this file only draws. The window text is in installer/text/<en|ru>.json under "ui.*" and "launcher.*" ids.
+A front end over the CLI (docs/installer.md): it collects the game files, the keys file path, the optional firmware
+folder, the game language and the install folder, runs `python -m installer ...` as a subprocess and shows its JSON
+events. Decisions live in guilogic.py; this file only draws. The window text is in installer/text/<en|ru>.json under
+"ui.*" and "launcher.*" ids.
 
     --selftest [--shots DIR]   build every screen in both languages and close by itself (PNG per screen with --shots)
     --lang en|ru               window language (default: the Windows display language)
@@ -51,7 +52,7 @@ class App:
         self.run_args = run_args or {}   # extra CLI options for tests: temp, verify
         self.log_entries = []            # events and raw lines of the run, rendered by render_log
         self.bound = []                  # (widget, option, id, params) retranslated on a language switch
-        self.vars = {n: tk.StringVar() for n in ('base', 'update', 'keys', 'dest')}
+        self.vars = {n: tk.StringVar() for n in ('base', 'update', 'keys', 'firmware', 'dest')}
         self.vars['lang'] = tk.StringVar()
         self.lang_code = default_game_language(ui_lang)
         self.screen = None
@@ -197,6 +198,10 @@ class App:
             b.grid(row=i, column=2, padx=(8, 0))
             self.form_rows[name] = lab
         i = len(rows)
+        self.label(grid, 'ui.firmware').grid(row=i, column=0, sticky='w', pady=4)
+        ttk.Entry(grid, textvariable=self.vars['firmware']).grid(row=i, column=1, sticky='ew', pady=4)
+        self.button(grid, 'ui.browse', self.pick_firmware).grid(row=i, column=2, padx=(8, 0))
+        i += 1
         self.label(grid, 'ui.game_language').grid(row=i, column=0, sticky='w', pady=4)
         self.lang_box = ttk.Combobox(grid, textvariable=self.vars['lang'], state='readonly', width=30)
         self.lang_box.grid(row=i, column=1, sticky='w', pady=4)
@@ -206,6 +211,7 @@ class App:
         self.label(grid, 'ui.dest').grid(row=i + 1, column=0, sticky='w', pady=4)
         ttk.Entry(grid, textvariable=self.vars['dest']).grid(row=i + 1, column=1, sticky='ew', pady=4)
         self.button(grid, 'ui.browse', self.pick_dest).grid(row=i + 1, column=2, padx=(8, 0))
+        self.label(f, 'ui.firmware_help', wraplength=620, justify='left').pack(anchor='w', pady=(8, 0))
         self.update_hint = ttk.Label(f, wraplength=620, justify='left')
         self.update_hint.pack(anchor='w', pady=(8, 0))
         self.form_error = ttk.Label(f, style='Err.TLabel', wraplength=620, justify='left')
@@ -266,7 +272,7 @@ class App:
 
     def form(self):
         return Form(base=self.vars['base'].get(), update=self.vars['update'].get(), keys=self.vars['keys'].get(),
-                    lang=self.selected_lang(), dest=self.vars['dest'].get())
+                    firmware=self.vars['firmware'].get(), lang=self.selected_lang(), dest=self.vars['dest'].get())
 
     def refresh_form(self):
         form = self.form()
@@ -290,6 +296,11 @@ class App:
         if path:
             self.vars[name].set(os.path.normpath(path))
 
+    def pick_firmware(self):
+        path = filedialog.askdirectory(title=self.cat('ui.pick_firmware'), mustexist=True)
+        if path:
+            self.vars['firmware'].set(os.path.normpath(path))
+
     def pick_dest(self):
         path = filedialog.askdirectory(title=self.cat('ui.pick_dest'), mustexist=False)
         if path:
@@ -306,7 +317,7 @@ class App:
             return
         self.form_error.configure(text='')
         command = form.command(self.layout.python, root=self.layout.root if self.layout.dev else None,
-                               temp=self.run_args.get('temp'), verify=self.run_args.get('verify', False))
+                               temp=self.run_args.get('temp'), verify_hashes=self.run_args.get('verify', False))
         self.begin(command, self.layout.root)
 
     def begin(self, command, cwd):
@@ -495,10 +506,10 @@ class App:
 # ---- self test ---------------------------------------------------------------------------------------------------
 
 SAMPLE_START = {'type': 'start', 'release': 'selftest', 'mode': 'install', 'dest': 'Z:/selftest/TotK', 'log': 'D:\\log.txt',
-                'steps': ['check', 'extract', 'lift', 'compile', 'prepare', 'cleanup']}
+                'steps': ['check', 'fonts', 'extract', 'lift', 'compile', 'prepare', 'cleanup']}
 SAMPLE_RUN = [
     SAMPLE_START,
-    {'type': 'plan', 'run': ['check', 'extract'], 'skip': {}},
+    {'type': 'plan', 'run': ['check', 'fonts', 'extract'], 'skip': {}},
     {'type': 'step', 'step': 'check', 'state': 'started'},
     {'type': 'progress', 'step': 'check', 'phase': 'inputs'},
     {'type': 'space', 'dest': 'Z:/selftest/TotK', 'need': 36_400_000_000, 'free': 210_000_000_000, 'temp': 'C:\\t',
@@ -511,12 +522,14 @@ SAMPLE_RUN = [
 ]
 
 
-SAMPLE_OK = [SAMPLE_START, {'type': 'plan', 'run': ['check', 'extract'], 'skip': {'lift': 'current', 'compile': 'current',
-                                                                       'prepare': 'current', 'cleanup': 'not_needed'}},
+SAMPLE_OK = [SAMPLE_START, {'type': 'plan', 'run': ['check', 'extract'], 'skip': {'fonts': 'current', 'lift': 'current',
+                                                                       'compile': 'current', 'prepare': 'current',
+                                                                       'cleanup': 'not_needed'}},
              {'type': 'step', 'step': 'check', 'state': 'started'},
              {'type': 'step', 'step': 'check', 'state': 'done', 'seconds': 1.0},
              {'type': 'step', 'step': 'extract', 'state': 'started'},
              {'type': 'step', 'step': 'extract', 'state': 'done', 'seconds': 1.0},
+             {'type': 'step', 'step': 'fonts', 'state': 'skipped', 'reason': 'current'},
              {'type': 'step', 'step': 'lift', 'state': 'skipped', 'reason': 'current'},
              {'type': 'step', 'step': 'compile', 'state': 'skipped', 'reason': 'current'},
              {'type': 'step', 'step': 'prepare', 'state': 'skipped', 'reason': 'current'},
diff --git a/installer/guilogic.py b/installer/guilogic.py
index 8d6c4e91..3343c187 100644
--- a/installer/guilogic.py
+++ b/installer/guilogic.py
@@ -25,7 +25,7 @@ from .events import render
 
 TEXT = Path(__file__).resolve().parent / 'text'
 UI_LANGUAGES = ('en', 'ru')
-STEP_ORDER = ('check', 'extract', 'lift', 'compile', 'prepare', 'cleanup')
+STEP_ORDER = ('check', 'fonts', 'extract', 'lift', 'compile', 'prepare', 'cleanup')
 # message parameter -> catalog id prefix of the names that replace its raw values
 PARAM_NAMES = {'lang': 'lang.', 'known': 'lang.', 'step': 'step.', 'input': 'param.input.'}
 LANG_RU = 0x19   # primary language id of Russian in a Windows LANGID
@@ -111,6 +111,7 @@ class Form:
     base: str = ''
     update: str = ''
     keys: str = ''
+    firmware: str = ''
     lang: str = ''
     dest: str = ''
 
@@ -147,19 +148,21 @@ class Form:
                 value = getattr(self, name).strip()
                 if value and not Path(value).is_file():
                     found.append(f'ui.missing_{name}')
+        if self.firmware.strip() and not Path(self.firmware.strip()).is_dir():
+            found.append('ui.missing_firmware')
         return found
 
-    def command(self, python, root=None, temp=None, verify=False):
+    def command(self, python, root=None, temp=None, verify_hashes=False):
         cmd = [str(python), '-m', 'installer']
         for flag, value in (('--base', self.base), ('--update', self.update), ('--keys', self.keys),
-                            ('--lang', self.lang), ('--dest', self.dest)):
+                            ('--firmware', self.firmware), ('--lang', self.lang), ('--dest', self.dest)):
             if value.strip():
                 cmd += [flag, value.strip()]
         if root:
             cmd += ['--root', str(root)]
         if temp:
             cmd += ['--temp', str(temp)]
-        if verify:
+        if verify_hashes:
             cmd.append('--verify')
         return cmd
 
diff --git a/installer/ini.py b/installer/ini.py
index 13147862..5cad6f00 100644
--- a/installer/ini.py
+++ b/installer/ini.py
@@ -14,7 +14,8 @@ LANGUAGES = ('ja', 'en-US', 'en-GB', 'fr', 'fr-CA', 'de', 'it', 'es', 'es-419',
              'zh-Hans', 'zh-Hant')
 # Older installer builds wrote these two codes; they are read as the canonical ones and rewritten on the next install.
 ALIASES = {'zh-CN': 'zh-Hans', 'zh-TW': 'zh-Hant'}
-# Their text falls back to the Switch shared fonts (runtime/ov_system.c), which the installer does not extract.
+# Their text falls back to the Switch shared fonts (runtime/ov_system.c), which the fonts step extracts from the
+# firmware folder when the player gives one.
 NEED_SHARED_FONTS = ('ko', 'zh-Hans', 'zh-Hant')
 
 ACTIVE = re.compile(r'^(\s*)(?:totk_)?lang(\s*=\s*)(.*?)(\s*)$', re.IGNORECASE)
diff --git a/installer/layout.py b/installer/layout.py
index 7f31443e..4dfcd64c 100644
--- a/installer/layout.py
+++ b/installer/layout.py
@@ -81,6 +81,7 @@ class Layout:
         """Paths the steps need that do not exist."""
         need = [self.python, self.tools / 'extract.py', self.tools / 'build_game.py', self.tools / 'prepare_shaders.py',
                 self.tools / 'pack_shader_cache.py', self.tools / 'make_romfs_patches.py', self.tools / 'ultrawide_layout.py',
+                self.tools / 'vendor' / 'macnativegames' / 'extract_shared_fonts.py',
                 self.recomp / 'gen.py',
                 self.clang,
                 *((self.deps / 'include', self.deps / 'lib') if self.deps else ()), self.runtime, self.runtime_lib, self.ninja, self.hactool,
diff --git a/installer/steps.py b/installer/steps.py
index 2a165641..74d00531 100644
--- a/installer/steps.py
+++ b/installer/steps.py
@@ -1,13 +1,14 @@
-"""The six setup steps of docs/installer.md: check, extract, lift, compile, prepare, cleanup.
+"""The seven setup steps of docs/installer.md: check, fonts, extract, lift, compile, prepare, cleanup.
 
-Extraction runs in this process through tools/extract.py (the package's sibling tools/, which ships with it); lift,
-compile and prepare run the bundled Python on recomp/gen.py, tools/build_game.py, tools/make_romfs_patches.py and
-tools/prepare_shaders.py, whose output goes to <temp>/logs/<step>-<tool>.log and is read for progress. No Win32 call
-here: the host check is a small C program built with the bundled clang (hostcheck.c).
+Extraction runs in this process through tools/extract.py (the package's sibling tools/, which ships with it); fonts
+runs the vendored extract_shared_fonts.py on the firmware folder; lift, compile and prepare run the bundled Python on
+recomp/gen.py, tools/build_game.py, tools/make_romfs_patches.py and tools/prepare_shaders.py, whose output goes to
+<temp>/logs/<step>-<tool>.log and is read for progress. No Win32 call here: the host check is a small C program built
+with the bundled clang (hostcheck.c).
 
-Install folder: exefs/, romfs/ (romfs.bin, index.json), profile/, totk.exe and its DLLs, romfs-index.bin,
-romfs-patches/, romfs-patches-xbox/, totk_xlate.exe, the shader state of totk.exe --prepare-shaders, totk.ini,
-totk-install.json.
+Install folder: exefs/, romfs/ (romfs.bin, index.json), profile/, shared-fonts/ (Chinese and Korean text), totk.exe
+and its DLLs, romfs-index.bin, romfs-patches/, romfs-patches-xbox/, totk_xlate.exe, the shader state of
+totk.exe --prepare-shaders, totk.ini, totk-install.json.
 Temp folder (<temp>/<dest name>-<hash>): check/ (ExeFS of both inputs, the host check), gen/ (C), build/ (objects),
 logs/ (kept by the cleanup).
 """
@@ -217,6 +218,64 @@ def size_of(paths):
     return sum(p.stat().st_size for p in paths if p.is_file())
 
 
+# The Switch system shared fonts (runtime/ov_system.c): TotK falls back to them for Chinese, Korean and Traditional
+# Chinese text. tools/vendor/macnativegames/extract_shared_fonts.py writes these names.
+SHARED_FONTS = 'shared-fonts'
+SHARED_FONT_FILES = ('0-standard.bfttf', '1-chinese-simplified.bfttf', '2-chinese-simplified-extension.bfttf',
+                     '3-chinese-traditional.bfttf', '4-korean.bfttf', '5-nintendo-extension.bfttf')
+FONTS_NEED = 32 << 20     # the six BFTTF files and their manifest
+
+
+def requested_lang(ctx):
+    """The language this run uses: --lang, else the one recorded for the install (Check canonicalizes it)."""
+    return ini.canonical_language(getattr(ctx.options, 'lang', None) or ctx.state.get('lang'))
+
+
+def firmware_dir(value):
+    """The firmware NCA folder behind a --firmware path: the folder itself, or its registered/ child (the emulators'
+    layout, Contents/registered)."""
+    if not value:
+        return None
+    path = Path(value)
+    return path / 'registered' if (path / 'registered').is_dir() else path
+
+
+def firmware_has_ncas(folder):
+    """Whether folder holds firmware NCAs: .nca files, or the hashed directories with a 00 file (registered/)."""
+    try:
+        entries = list(Path(folder).iterdir())
+    except OSError:
+        return False
+    return any((e.is_file() and e.suffix.lower() == '.nca') or (e.is_dir() and (e / '00').is_file()) for e in entries)
+
+
+def firmware_stamp(folder):
+    """A cheap identity of the firmware NCAs: names, sizes and mtimes, not their contents (the folder is ~326 MB)."""
+    try:
+        entries = sorted(Path(folder).iterdir())
+    except OSError:
+        return 'missing'
+    rows = []
+    for entry in entries:
+        if entry.is_dir():
+            file = entry / '00'
+            if not file.is_file():
+                continue
+        elif not entry.is_file() or entry.suffix.lower() != '.nca':
+            continue
+        else:
+            file = entry
+        st = file.stat()
+        rows.append((entry.name, st.st_size, st.st_mtime_ns))
+    return rows
+
+
+def shared_fonts_ready(dest):
+    """Whether dest/shared-fonts holds a complete set that the game can load."""
+    folder = Path(dest) / SHARED_FONTS
+    return (folder / 'manifest.json').is_file() and all((folder / name).is_file() for name in SHARED_FONT_FILES)
+
+
 # ---- 1. check
 
 class Check(Step):
@@ -233,13 +292,30 @@ class Check(Step):
         own = (ctx.temp, *ctx.temp.parents)   # a temp folder inside the install folder (installer/cli.py) is ours
         if ctx.mode == 'install' and dest.is_dir() and any(p not in own for p in dest.iterdir()):
             raise InstallError('check.dest_not_empty', path=str(dest))
-        lang = ini.canonical_language(ctx.options.lang or ctx.state.get('lang'))
+        lang = requested_lang(ctx)
         if not lang:
             raise InstallError('check.lang_missing')
         if lang not in ini.LANGUAGES:
             raise InstallError('check.lang_unknown', lang=lang, known=', '.join(ini.LANGUAGES))
+        firmware = firmware_dir(getattr(ctx.options, 'firmware', None))
+        if firmware is not None:
+            if not firmware.is_dir():
+                raise InstallError('check.firmware_missing', path=str(firmware))
+            if not firmware_has_ncas(firmware):
+                raise InstallError('check.firmware_empty', path=str(firmware))
         if lang in ini.NEED_SHARED_FONTS:
-            rep.warning('warn.lang_needs_fonts', lang=lang)
+            if firmware is None:
+                rep.warning('warn.lang_needs_fonts', lang=lang)
+            elif not shared_fonts_ready(dest):
+                keys = getattr(ctx.options, 'keys', None)
+                if not keys or not Path(keys).is_file():
+                    raise InstallError('check.fonts_keys_needed')
+                try:
+                    key_values = load_keys(Path(keys))
+                except (ValueError, OSError, UnicodeDecodeError):
+                    raise InstallError('check.keys_unreadable') from None
+                if 'header_key' not in key_values:
+                    raise InstallError('check.keys_no_header_key')
         ctx.lang = lang
         ctx.temp.mkdir(parents=True, exist_ok=True)
 
@@ -368,6 +444,8 @@ class Check(Step):
             romfs = ctx.dest / 'romfs' / 'romfs.bin'
             if romfs.is_file():   # a resumed extraction replaces it
                 dest_need -= romfs.stat().st_size
+        if ctx.will_run('fonts'):
+            dest_need += FONTS_NEED
         if ctx.will_run('prepare') or ctx.will_run('extract'):
             dest_need += DEST_EXTRA
         if ctx.will_run('lift') or ctx.will_run('compile'):
@@ -419,7 +497,72 @@ class Check(Step):
         ctx.state['version'] = found
 
 
-# ---- 2. extract
+# ---- 2. fonts
+
+class Fonts(Step):
+    """The Switch system fonts for Chinese, Korean and Traditional Chinese text (tools/extract_fonts.py, which runs the
+    vendored extract_shared_fonts.py). The firmware folder is optional: without it the setup warns and the game runs
+    with those glyphs missing. The extraction verifies the firmware NCAs and writes the six BFTTF files the console
+    puts in shared memory."""
+
+    id = 'fonts'
+
+    def key(self, ctx):
+        lang = requested_lang(ctx)
+        if lang not in ini.NEED_SHARED_FONTS:
+            return fingerprint('fonts-1', 'not-needed')
+        firmware = firmware_dir(getattr(ctx.options, 'firmware', None))
+        if firmware is None:
+            return fingerprint('fonts-1', 'no-firmware')
+        return fingerprint('fonts-1', lang, str(firmware), firmware_stamp(firmware))
+
+    def current(self, ctx, record):
+        if requested_lang(ctx) not in ini.NEED_SHARED_FONTS or not getattr(ctx.options, 'firmware', None):
+            return True
+        return shared_fonts_ready(ctx.dest)
+
+    def verify(self, ctx, record):
+        # An update run may omit --firmware; the installed set still has to be there for these languages.
+        if requested_lang(ctx) in ini.NEED_SHARED_FONTS:
+            return shared_fonts_ready(ctx.dest)
+        return True
+
+    def run(self, ctx):
+        lang = getattr(ctx, 'lang', None) or requested_lang(ctx)
+        if lang not in ini.NEED_SHARED_FONTS:
+            return {}
+        firmware = firmware_dir(getattr(ctx.options, 'firmware', None))
+        if firmware is None:
+            return {}   # Check warned: the game runs, some text may not show
+        keys = getattr(ctx.options, 'keys', None)
+        if not keys:
+            raise InstallError('check.fonts_keys_needed')
+        out = ctx.temp / 'shared-fonts'
+        remove(out)
+        ctx.reporter.progress('fonts', 'extract', force=True)
+        tool = ctx.layout.tools / 'vendor' / 'macnativegames' / 'extract_shared_fonts.py'
+        code, log = run_tool(ctx, 'fonts', tool, ['--keys', keys, '--firmware', firmware, '--output', out])
+        if code:
+            detail = ''
+            try:
+                detail = log.read_text(encoding='utf-8', errors='replace').strip().splitlines()[-1][:300]
+            except (OSError, IndexError):
+                pass
+            raise InstallError('fonts.failed', code=code, detail=detail, log=str(log))
+        missing = [name for name in SHARED_FONT_FILES if not (out / name).is_file()]
+        if missing or not (out / 'manifest.json').is_file():
+            raise InstallError('fonts.incomplete', files=', '.join(missing) or 'manifest.json')
+        ctx.reporter.progress('fonts', 'copy', force=True)
+        try:
+            ctx.dest.mkdir(parents=True, exist_ok=True)
+            remove(ctx.dest / SHARED_FONTS)
+            shutil.move(str(out), str(ctx.dest / SHARED_FONTS))
+        except OSError as e:
+            raise InstallError('fonts.copy_failed', path=str(ctx.dest / SHARED_FONTS), detail=str(e)) from None
+        return {'files': len(SHARED_FONT_FILES)}
+
+
+# ---- 3. extract
 
 class Extract(Step):
     id = 'extract'
@@ -527,7 +670,7 @@ class Extract(Step):
             watch.stop()
 
 
-# ---- 3. lift
+# ---- 4. lift
 
 EMITTED = re.compile(r'^emitted (\d+)/(\d+) chunks')
 DISCOVERED = re.compile(r'^(\w+): \d+ functions \(.*discovery')
@@ -563,7 +706,7 @@ class Lift(Step):
         return {}
 
 
-# ---- 4. compile
+# ---- 5. compile
 
 NINJA_LINE = re.compile(r'^\[(\d+)/(\d+)\] ')
 
@@ -620,7 +763,7 @@ class Compile(Step):
         return {'exe_sha256': file_sha256(dest / exe.name)}
 
 
-# ---- 5. prepare
+# ---- 6. prepare
 
 TRANSLATED = re.compile(r'gfx_shader: prepare: (\d+) of (\d+) pairs')
 
@@ -718,7 +861,7 @@ class Prepare(Step):
         return {'xlate_sha256': file_sha256(xlate)}
 
 
-# ---- 6. clean up
+# ---- 7. clean up
 
 class Cleanup(Step):
     id = 'cleanup'
@@ -736,7 +879,7 @@ class Cleanup(Step):
         rep.progress('cleanup', 'temp', force=True)
         for stale in dest.glob('update-merge-*'):
             remove(stale)
-        for name in ('gen', 'build', 'check', 'shader_list.tsv'):
+        for name in ('gen', 'build', 'check', 'shader_list.tsv', 'shared-fonts'):
             remove(ctx.temp / name)
         romfs_problem(dest / 'romfs', expected_update(ctx))
         return {}
@@ -758,4 +901,4 @@ def romfs_problem(romfs, expected):
 
 
 def all_steps():
-    return [Check(), Extract(), Lift(), Compile(), Prepare(), Cleanup()]
+    return [Check(), Fonts(), Extract(), Lift(), Compile(), Prepare(), Cleanup()]
diff --git a/installer/text/en.json b/installer/text/en.json
index c792391e..10997e4a 100644
--- a/installer/text/en.json
+++ b/installer/text/en.json
@@ -1,5 +1,6 @@
 {
  "step.check": "Checking the computer and the game files",
+ "step.fonts": "Extracting the system fonts",
  "step.extract": "Extracting the game",
  "step.lift": "Translating the game code to C",
  "step.compile": "Compiling {game_exe}",
@@ -11,6 +12,8 @@
  "phase.check.verify_romfs": "Checking the installed game data",
  "phase.check.inputs": "Opening the game files with the keys",
  "phase.check.versions": "Checking the game versions",
+ "phase.fonts.extract": "Extracting the shared fonts from the firmware",
+ "phase.fonts.copy": "Copying the shared fonts into the install folder",
  "phase.extract.hash_base": "Computing the checksum of the base game",
  "phase.extract.hash_update": "Computing the checksum of the update",
  "phase.extract.exefs": "Extracting the game code",
@@ -67,10 +70,16 @@
  "check.base_wrong_version": "The base game is not version 1.0.0 ({modules} differ).",
  "check.update_wrong_version": "The update is version {found}; this release takes {wanted}.",
  "check.disk_space": "Not enough free space for {path}: {need_gb} GB needed, {free_gb} GB free.",
+ "check.firmware_missing": "The firmware folder {path} does not exist. Choose the firmware's Contents/registered folder.",
+ "check.firmware_empty": "The firmware folder {path} holds no NCA files. Choose the firmware's Contents/registered folder.",
+ "check.fonts_keys_needed": "The shared fonts for this language are not installed yet; choose prod.keys so the setup can extract them from the firmware.",
 
  "extract.exefs_mismatch": "The extracted game code does not match version {version} ({modules}).",
  "extract.romfs_merge_failed": "Applying the update to the game data failed: {detail}. Details: {log}",
  "extract.romfs_mismatch": "The extracted game data does not match version {version} (size {size}, checksum {sha256}...).",
+ "fonts.failed": "Extracting the shared fonts failed (exit code {code}): {detail}. Details: {log}",
+ "fonts.incomplete": "The shared font extraction did not write every file ({files}).",
+ "fonts.copy_failed": "The shared fonts cannot be copied into {path}: {detail}",
  "lift.failed": "Translating the game code failed (exit code {code}). Details: {log}",
  "compile.failed": "Compiling {game_exe} failed (exit code {code}). Details: {log}",
  "compile.exe_in_use": "{path} is in use. Close the game and run the installer again.",
@@ -81,7 +90,7 @@
  "prepare.pack_failed": "Packing the shader cache failed (exit code {code}). Details: {log}",
  "cleanup.ini_failed": "totk.ini cannot be written: {detail}",
 
- "warn.lang_needs_fonts": "Text in {lang} needs the Switch system fonts, which the installer does not extract; some text may not show.",
+ "warn.lang_needs_fonts": "Text in {lang} needs the Switch system fonts. Choose the firmware folder (Contents/registered) to install them; without it some text may not show.",
  "warn.npdm_differs": "main.npdm differs from the reference {version} dump; only the code modules are used.",
  "warn.xbox_prompts_failed": "The Xbox button prompts could not be prepared (exit code {code}); the game keeps the Switch prompts. Details: {log}",
  "warn.kernel_old": "Linux {version} lacks the write tracking the game relies on (6.7 or later); the game may run very slowly. Updating the system fixes this.",
@@ -94,13 +103,16 @@
  "ui.base": "Base game (NSP or XCI)",
  "ui.update": "Update 1.1.1 or 1.2.1 or 1.4.3 (NSP)",
  "ui.keys": "prod.keys",
+ "ui.firmware": "Firmware folder (optional)",
  "ui.game_language": "Game language",
  "ui.dest": "Install folder",
  "ui.browse": "Browse...",
  "ui.pick_game": "Choose the base game file",
  "ui.pick_update": "Choose the 1.1.1 or 1.2.1 or 1.4.3 update file",
  "ui.pick_keys": "Choose prod.keys",
+ "ui.pick_firmware": "Choose the Switch firmware folder (Contents/registered)",
  "ui.pick_dest": "Choose the install folder",
+ "ui.firmware_help": "For Chinese, Korean and Traditional Chinese text: the firmware's Contents/registered folder, for example from Ryujinx or Yuzu. The setup copies the Switch system fonts from it into the install folder.",
  "ui.type_game": "Game files (NSP, XCI)",
  "ui.type_nsp": "NSP files",
  "ui.type_keys": "Key files (*.keys)",
@@ -122,6 +134,7 @@
  "ui.missing_base": "The base game file does not exist.",
  "ui.missing_update": "The update file does not exist.",
  "ui.missing_keys": "The keys file does not exist.",
+ "ui.missing_firmware": "The firmware folder does not exist.",
  "ui.running_install": "Installing",
  "ui.running_resume": "Continuing the earlier setup",
  "ui.running_update": "Updating the installation",
diff --git a/installer/text/ru.json b/installer/text/ru.json
index e3a668ba..af4074eb 100644
--- a/installer/text/ru.json
+++ b/installer/text/ru.json
@@ -1,5 +1,6 @@
 {
  "step.check": "Проверка компьютера и игровых файлов",
+ "step.fonts": "Извлечение системных шрифтов",
  "step.extract": "Распаковка игры",
  "step.lift": "Перевод кода игры в C",
  "step.compile": "Сборка {game_exe}",
@@ -11,6 +12,8 @@
  "phase.check.verify_romfs": "Проверка установленных данных игры",
  "phase.check.inputs": "Открытие игровых файлов с помощью ключей",
  "phase.check.versions": "Проверка версий игры",
+ "phase.fonts.extract": "Извлечение общих шрифтов из прошивки",
+ "phase.fonts.copy": "Копирование общих шрифтов в папку установки",
  "phase.extract.hash_base": "Подсчёт контрольной суммы базовой игры",
  "phase.extract.hash_update": "Подсчёт контрольной суммы обновления",
  "phase.extract.exefs": "Распаковка кода игры",
@@ -67,10 +70,16 @@
  "check.base_wrong_version": "Базовая игра не версии 1.0.0 (отличаются модули: {modules}).",
  "check.update_wrong_version": "Версия обновления {found}; этот выпуск принимает {wanted}.",
  "check.disk_space": "Не хватает свободного места для {path}: нужно {need_gb} ГБ, свободно {free_gb} ГБ.",
+ "check.firmware_missing": "Папки прошивки {path} нет. Выберите папку Contents/registered прошивки.",
+ "check.firmware_empty": "В папке прошивки {path} нет файлов NCA. Выберите папку Contents/registered прошивки.",
+ "check.fonts_keys_needed": "Общие шрифты для этого языка ещё не установлены; выберите prod.keys, чтобы установка извлекла их из прошивки.",
 
  "extract.exefs_mismatch": "Распакованный код игры не соответствует версии {version} ({modules}).",
  "extract.romfs_merge_failed": "Не удалось применить обновление к данным игры: {detail}. Подробности: {log}",
  "extract.romfs_mismatch": "Распакованные данные игры не соответствуют версии {version} (размер {size}, контрольная сумма {sha256}...).",
+ "fonts.failed": "Не удалось извлечь общие шрифты (код выхода {code}): {detail}. Подробности: {log}",
+ "fonts.incomplete": "При извлечении общих шрифтов записаны не все файлы ({files}).",
+ "fonts.copy_failed": "Не удаётся скопировать общие шрифты в {path}: {detail}",
  "lift.failed": "Не удалось перевести код игры (код выхода {code}). Подробности: {log}",
  "compile.failed": "Не удалось собрать {game_exe} (код выхода {code}). Подробности: {log}",
  "compile.exe_in_use": "Файл {path} занят. Закройте игру и запустите установку снова.",
@@ -81,7 +90,7 @@
  "prepare.pack_failed": "Не удалось упаковать кэш шейдеров (код выхода {code}). Подробности: {log}",
  "cleanup.ini_failed": "Не удаётся записать totk.ini: {detail}",
 
- "warn.lang_needs_fonts": "Для языка «{lang}» нужны системные шрифты Switch, которые установка не извлекает; часть текста может не отображаться.",
+ "warn.lang_needs_fonts": "Для языка «{lang}» нужны системные шрифты Switch. Выберите папку прошивки (Contents/registered), чтобы установить их; без неё часть текста может не отображаться.",
  "warn.npdm_differs": "main.npdm отличается от эталонного дампа {version}; используются только модули с кодом.",
  "warn.xbox_prompts_failed": "Не удалось подготовить подсказки кнопок Xbox (код выхода {code}); игра оставит подсказки Switch. Подробности: {log}",
  "warn.kernel_old": "В Linux {version} нет отслеживания записи, на которое опирается игра (нужна версия 6.7 или новее); игра может работать очень медленно. Обновление системы это исправит.",
@@ -94,13 +103,16 @@
  "ui.base": "Базовая игра (NSP или XCI)",
  "ui.update": "Обновление 1.1.1 или 1.2.1 или 1.4.3 (NSP)",
  "ui.keys": "prod.keys",
+ "ui.firmware": "Папка прошивки (необязательно)",
  "ui.game_language": "Язык игры",
  "ui.dest": "Папка установки",
  "ui.browse": "Обзор...",
  "ui.pick_game": "Выберите файл базовой игры",
  "ui.pick_update": "Выберите файл обновления 1.1.1 или 1.2.1 или 1.4.3",
  "ui.pick_keys": "Выберите prod.keys",
+ "ui.pick_firmware": "Выберите папку прошивки Switch (Contents/registered)",
  "ui.pick_dest": "Выберите папку установки",
+ "ui.firmware_help": "Для текста на китайском и корейском: папка Contents/registered прошивки, например из Ryujinx или Yuzu. Установка скопирует из неё системные шрифты Switch в папку установки.",
  "ui.type_game": "Файлы игры (NSP, XCI)",
  "ui.type_nsp": "Файлы NSP",
  "ui.type_keys": "Файлы ключей (*.keys)",
@@ -122,6 +134,7 @@
  "ui.missing_base": "Файл базовой игры не найден.",
  "ui.missing_update": "Файл обновления не найден.",
  "ui.missing_keys": "Файл ключей не найден.",
+ "ui.missing_firmware": "Папки прошивки нет.",
  "ui.running_install": "Установка",
  "ui.running_resume": "Продолжение прерванной установки",
  "ui.running_update": "Обновление установки",
diff --git a/tests/installer_gui_test.py b/tests/installer_gui_test.py
index 4eb9c228..db9916e9 100644
--- a/tests/installer_gui_test.py
+++ b/tests/installer_gui_test.py
@@ -30,7 +30,7 @@ from installer import layout as layouts  # noqa: E402
 from installer import state as statefile  # noqa: E402
 from installer.events import Reporter  # noqa: E402
 from installer.runner import Context  # noqa: E402
-from installer.steps import all_steps  # noqa: E402
+from installer.steps import Fonts, all_steps  # noqa: E402
 from installer.guilogic import (DONE, FAILED, PENDING, RUNNING, SKIPPED, Catalog, Form, Model, Process,  # noqa: E402
                                 amount, describe_event, parse_line, windows_ui_language)
 
@@ -38,7 +38,7 @@ INSTALLED = ROOT / 'build' / 'install-test'
 FIXTURE = ROOT / 'build' / 'inst-gui' / 'e2e-install'
 COPIED = ('totk.ini', statefile.NAME)   # written by a run, so never linked
 START = {'type': 'start', 'release': 'r1', 'mode': 'install', 'dest': 'D:\\T', 'log': 'D:\\T.log',
-         'steps': ['check', 'extract', 'lift', 'compile', 'prepare', 'cleanup']}
+         'steps': ['check', 'fonts', 'extract', 'lift', 'compile', 'prepare', 'cleanup']}
 
 
 def fold(*events):
@@ -66,7 +66,7 @@ class ModelTest(unittest.TestCase):
         m = fold(START, {'type': 'plan', 'run': ['check', 'extract'], 'skip': {'lift': 'current', 'compile': 'current'}},
                  {'type': 'step', 'step': 'check', 'state': 'started'})
         self.assertEqual([m.states[s] for s in m.steps],
-                         [RUNNING, PENDING, SKIPPED, SKIPPED, PENDING, PENDING])
+                         [RUNNING, PENDING, PENDING, SKIPPED, SKIPPED, PENDING, PENDING])
         self.assertEqual(m.current, 'check')
         m.apply({'type': 'step', 'step': 'check', 'state': 'done', 'seconds': 1.0})
         self.assertEqual(m.states['check'], DONE)
@@ -137,10 +137,12 @@ class ModelTest(unittest.TestCase):
 
 
 class RunStatesTest(unittest.TestCase):
-    OK = [START, {'type': 'plan', 'run': ['check', 'extract'], 'skip': {'lift': 'current', 'compile': 'current',
-                                                                     'prepare': 'current', 'cleanup': 'not_needed'}},
+    OK = [START, {'type': 'plan', 'run': ['check', 'extract'], 'skip': {'fonts': 'current', 'lift': 'current',
+                                                                     'compile': 'current', 'prepare': 'current',
+                                                                     'cleanup': 'not_needed'}},
           {'type': 'step', 'step': 'check', 'state': 'started'}, {'type': 'step', 'step': 'check', 'state': 'done'},
           {'type': 'step', 'step': 'extract', 'state': 'started'}, {'type': 'step', 'step': 'extract', 'state': 'done'},
+          {'type': 'step', 'step': 'fonts', 'state': 'skipped'},
           {'type': 'step', 'step': 'lift', 'state': 'skipped'}, {'type': 'step', 'step': 'compile', 'state': 'skipped'},
           {'type': 'step', 'step': 'prepare', 'state': 'skipped'}, {'type': 'step', 'step': 'cleanup', 'state': 'done'},
           {'type': 'end', 'result': 'ok', 'seconds': 1}]
@@ -200,11 +202,20 @@ class FormTest(unittest.TestCase):
     def test_unknown_language(self):
         self.assertEqual(self.form(lang='xx').problems(), ['ui.need_lang'])
 
+    def test_firmware_folder(self):
+        firmware = self.dir / 'firmware'
+        firmware.mkdir()
+        self.assertEqual(self.form(firmware=str(firmware)).problems(), [])
+        self.assertEqual(self.form(firmware=str(self.dir / 'no-firmware')).problems(), ['ui.missing_firmware'])
+
     def test_command(self):
-        cmd = self.form().command('py.exe', root=ROOT, temp=self.dir / 't', verify=True)
+        firmware = self.dir / 'firmware'
+        firmware.mkdir()
+        cmd = self.form(firmware=str(firmware)).command('py.exe', root=ROOT, temp=self.dir / 't', verify_hashes=True)
         self.assertEqual(cmd[:3], ['py.exe', '-m', 'installer'])
-        for flag in ('--base', '--update', '--keys', '--lang', '--dest', '--root', '--temp', '--verify'):
+        for flag in ('--base', '--update', '--keys', '--firmware', '--lang', '--dest', '--root', '--temp', '--verify'):
             self.assertIn(flag, cmd)
+        self.assertEqual(cmd[cmd.index('--firmware') + 1], str(firmware))
         self.assertEqual(cmd[cmd.index('--lang') + 1], 'en-US')
 
     def test_installed_folder_needs_only_itself(self):
@@ -244,7 +255,7 @@ class CatalogTest(unittest.TestCase):
         cat = Catalog('en')
         ids = ['ui.' + n for n in ('title', 'start', 'cancel', 'open_folder', 'notice', 'space_one', 'space_two',
                                    'process_died', 'result_ok', 'result_failed', 'result_cancelled')]
-        ids += [f'step.{s}' for s in ('check', 'extract', 'lift', 'compile', 'prepare', 'cleanup')]
+        ids += [f'step.{s}' for s in ('check', 'fonts', 'extract', 'lift', 'compile', 'prepare', 'cleanup')]
         ids += ['ui.state_' + n for n in ('started', 'done', 'skipped', 'pending', 'running', 'failed')]
         for lang in ('en', 'ru'):
             cat.set_language(lang)
@@ -334,6 +345,10 @@ def make_fixture():
     ctx = Context(layout, FIXTURE, ROOT / 'build' / 'inst-gui' / 'e2e-temp', Reporter(out=io.StringIO()), options, state=state)
     ctx.steps = all_steps()
     ctx.plan()
+    # An install made before the fonts step has no record for it: record it as current when its output is (the
+    # languages that need the fonts have them in shared-fonts/).
+    if Fonts().current(ctx, {}):
+        state['steps'].setdefault('fonts', {'release': state.get('release', ''), 'key': ctx.keys['fonts']})
     for step_id, record in state['steps'].items():
         record['key'] = ctx.keys[step_id]
     statefile.save(FIXTURE, state)
@@ -346,7 +361,7 @@ class EndToEndTest(unittest.TestCase):
     def run_cli(form, temp, tries=1):
         """Runs the CLI in --verify mode through Process, up to `tries` times while the RomFS hash reads wrong."""
         for attempt in range(tries):
-            p = Process(form.command(sys.executable, root=ROOT, temp=temp, verify=True), cwd=ROOT)
+            p = Process(form.command(sys.executable, root=ROOT, temp=temp, verify_hashes=True), cwd=ROOT)
             model, stray = Model(), []
             t0, code = time.monotonic(), None
             while code is None and time.monotonic() - t0 < 600:
@@ -384,7 +399,7 @@ class EndToEndTest(unittest.TestCase):
 
     def test_cancel_during_the_check(self):
         cmd = Form(dest=str(make_fixture())).command(sys.executable, root=ROOT, temp=ROOT / 'build' / 'inst-gui' / 'e2e-temp',
-                                                     verify=True)
+                                                     verify_hashes=True)
         p = Process(cmd, cwd=ROOT)
         model, t0, code, cancelled = Model(), time.monotonic(), None, False
         while code is None and time.monotonic() - t0 < 120:
diff --git a/tests/installer_test.py b/tests/installer_test.py
index 036d897a..bc248f58 100644
--- a/tests/installer_test.py
+++ b/tests/installer_test.py
@@ -291,6 +291,108 @@ class CleanupTest(unittest.TestCase):
         self.assertEqual(self.run_cleanup(), 'cleanup.romfs_unreadable')
 
 
+class FontsTest(unittest.TestCase):
+    """The fonts step: keyed by language and firmware, a no-op without firmware, writes dest/shared-fonts."""
+
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        base = Path(self.tmp.name)
+        self.dest, temp, self.firmware = base / 'dest', base / 'temp', base / 'firmware'
+        temp.mkdir()
+        self.firmware.mkdir()
+        (self.firmware / 'a.nca').write_bytes(b'nca')
+        self.keys = base / 'prod.keys'
+        self.keys.write_text('header_key = 00\n')
+        self.ctx = SimpleNamespace(dest=self.dest, temp=temp, lang='zh-Hans', state={},
+                                   layout=SimpleNamespace(tools=ROOT / 'tools', root=ROOT),
+                                   reporter=Reporter(out=io.StringIO()),
+                                   options=SimpleNamespace(lang='zh-Hans', firmware=self.firmware, keys=str(self.keys)))
+        self.saved_run_tool = steps.run_tool
+
+    def tearDown(self):
+        steps.run_tool = self.saved_run_tool
+        self.ctx.reporter.close()
+        self.tmp.cleanup()
+
+    def fake_tool(self, files=None, code=0):
+        """Stand-in for extract_shared_fonts.py: writes the requested files where --output points."""
+        def run(ctx, step, script, args):
+            out = Path(args[args.index('--output') + 1])
+            out.mkdir(parents=True)
+            for name in steps.SHARED_FONT_FILES if files is None else files:
+                (out / name).write_bytes(b'bfttf')
+            (out / 'manifest.json').write_text('{}')
+            log = ctx.temp / 'fonts.log'
+            log.write_text('error line\n')
+            return code, log
+        steps.run_tool = run
+
+    def test_all_steps_order(self):
+        self.assertEqual([s.id for s in steps.all_steps()],
+                         ['check', 'fonts', 'extract', 'lift', 'compile', 'prepare', 'cleanup'])
+
+    def test_extracts_into_the_install_folder(self):
+        self.fake_tool()
+        self.assertEqual(steps.Fonts().run(self.ctx), {'files': 6})
+        self.assertTrue(steps.shared_fonts_ready(self.dest))
+        self.assertEqual(sorted(p.name for p in (self.dest / 'shared-fonts').iterdir()),
+                         sorted((*steps.SHARED_FONT_FILES, 'manifest.json')))
+
+    def test_noop_without_firmware(self):
+        self.ctx.options.firmware = None
+        self.fake_tool()
+        self.assertEqual(steps.Fonts().run(self.ctx), {})
+        self.assertFalse((self.dest / 'shared-fonts').exists())
+
+    def test_noop_for_other_languages(self):
+        self.ctx.lang, self.ctx.options.lang = 'en-US', 'en-US'
+        self.fake_tool()
+        self.assertEqual(steps.Fonts().run(self.ctx), {})
+        self.assertFalse((self.dest / 'shared-fonts').exists())
+
+    def test_failed_extraction_keeps_the_old_folder(self):
+        self.fake_tool()
+        steps.Fonts().run(self.ctx)
+        self.fake_tool(code=1)
+        with self.assertRaises(steps.InstallError) as e:
+            steps.Fonts().run(self.ctx)
+        self.assertEqual(e.exception.id, 'fonts.failed')
+        self.assertTrue(steps.shared_fonts_ready(self.dest))
+
+    def test_incomplete_output_is_an_error(self):
+        self.fake_tool(files=steps.SHARED_FONT_FILES[:1])
+        with self.assertRaises(steps.InstallError) as e:
+            steps.Fonts().run(self.ctx)
+        self.assertEqual(e.exception.id, 'fonts.incomplete')
+
+    def test_current_tracks_language_and_output(self):
+        fonts = steps.Fonts()
+        self.assertFalse(fonts.current(self.ctx, {}))
+        self.fake_tool()
+        fonts.run(self.ctx)
+        self.assertTrue(fonts.current(self.ctx, {}))
+        self.ctx.options.lang = 'en-US'
+        self.assertTrue(fonts.current(self.ctx, {}))
+        self.ctx.options.lang = 'zh-Hans'
+        (self.dest / 'shared-fonts' / '0-standard.bfttf').unlink()
+        self.assertFalse(fonts.current(self.ctx, {}))
+
+    def test_key_changes_with_language_and_firmware(self):
+        fonts = steps.Fonts()
+        zh = fonts.key(self.ctx)
+        self.ctx.options.lang = 'en-US'
+        self.assertNotEqual(zh, fonts.key(self.ctx))
+        self.ctx.options.lang = 'zh-Hans'
+        (self.firmware / 'b.nca').write_bytes(b'other')
+        self.assertNotEqual(zh, fonts.key(self.ctx))
+
+    def test_registered_child_is_used(self):
+        nested = self.firmware / 'registered'
+        nested.mkdir()
+        (nested / 'c.nca').write_bytes(b'nca')
+        self.assertEqual(steps.firmware_dir(self.firmware), nested)
+
+
 class EventsTest(unittest.TestCase):
     def test_lines_are_json_and_the_log_is_english(self):
         with tempfile.TemporaryDirectory() as d:
diff --git a/totk.ini.example b/totk.ini.example
index 6d3d5f1e..bbd2545c 100644
--- a/totk.ini.example
+++ b/totk.ini.example
@@ -215,6 +215,9 @@
 [files]
 # Folder with RomFS mod files that replace or add game files. Default: none.
 # romfs_mods =
+# Folder with the Switch shared fonts (BFTTF files, tools/extract_fonts.py output), for Chinese and Korean text.
+# Default: shared-fonts next to totk.exe. TOTK_SHARED_FONTS overrides it.
+# shared_fonts =
 
 [diagnostics]
 # Extra lines in the log, comma separated: svc, host, ipc, fs, gfx, perf, sched, audio, present or all. The menu's