diff --git a/install.ps1 b/install.ps1
index 19035cf81..394040952 100644
--- a/install.ps1
+++ b/install.ps1
@@ -16,7 +16,7 @@
     # and Invoke-WebRequest throws on a cut transfer before the hash is read:
     # the site's build rewrites this line there (scripts/sitebootstrap.py).
     $mismatchAdvice = "The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-    $defaultInstallSha256 = "0aacd5847f927fe058de40f34f09ba4676acafe9d3e3d6c4228e46a474ed8744"
+    $defaultInstallSha256 = "144f419239eaf12447b68b293d1c1d15294e45bca2344dea4a9da66fba7582cd"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
diff --git a/install.py b/install.py
index e9d697b78..96437450d 100644
--- a/install.py
+++ b/install.py
@@ -14156,6 +14156,12 @@ def _card_and_below(setup: CardSetup, path: Path) -> tuple[Path, bool]:
     name: an Onion card mounted as BIOS was read as a BIOS folder, its
     parent checked as the card and refused."""
     below = setup.below
+    if (not below and setup.name in _GAMES_PART_CARDS and path.name.casefold() == "bios"
+            and not _is_dir(path / "bios") and _card_is(setup, path)[0] == "unknown"
+            and not _card_boundary(path)):
+        # Its list writes bios/ below the games part's root: its BIOS
+        # folder named got bios/bios, or was refused as inside the card.
+        return path.parent, True
     depth = len(PurePosixPath(below).parts)
     if (below and _ends_with(path, below) and _card_is(setup, path)[0] == "unknown"
             and not any(_card_boundary(folder)
@@ -14312,7 +14318,8 @@ def card_choice(named: str, plat: str, root: Path) -> CardChoice:
                               f"{setup.name} card, whose root is {shown_path(holder[2])}",
                               short=f"That is inside {_a(setup.name)} card.",
                               below=setup.below, root=holder[2])
-    folder = root if inside or not setup.below else card / setup.below
+    folder = (card if inside and not setup.below
+              else root if inside or not setup.below else card / setup.below)
     if kind == "other":
         return _not_the_card(setup, root, card, what)
     if kind == "own":
diff --git a/install.sh b/install.sh
index d5eaaea86..ff6303641 100755
--- a/install.sh
+++ b/install.sh
@@ -23,7 +23,7 @@ DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/ins
 # curl or wget stop on a cut transfer before the hash is read: the site's
 # build rewrites this line there (scripts/sitebootstrap.py).
 MISMATCH_ADVICE="The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-DEFAULT_INSTALL_SHA256="0aacd5847f927fe058de40f34f09ba4676acafe9d3e3d6c4228e46a474ed8744"
+DEFAULT_INSTALL_SHA256="144f419239eaf12447b68b293d1c1d15294e45bca2344dea4a9da66fba7582cd"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {
diff --git a/install/launchers/index.json b/install/launchers/index.json
index 300728f9c..838151168 100644
--- a/install/launchers/index.json
+++ b/install/launchers/index.json
@@ -27,8 +27,8 @@
         {
           "dest": "roms/ports/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1089259,
-          "sha256": "0aacd5847f927fe058de40f34f09ba4676acafe9d3e3d6c4228e46a474ed8744",
+          "size": 1089708,
+          "sha256": "144f419239eaf12447b68b293d1c1d15294e45bca2344dea4a9da66fba7582cd",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1142886,
-        "sha256": "4068768b8a88f1caa5238a8f9b5f0a0a34c1a6acab3577b54075c4163ca37ca6"
+        "size": 1143335,
+        "sha256": "9f312c89654b2e3d07fc9f741a3d714c6a14342b27b81fe08f281b159dfeff14"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1089259,
-          "sha256": "0aacd5847f927fe058de40f34f09ba4676acafe9d3e3d6c4228e46a474ed8744",
+          "size": 1089708,
+          "sha256": "144f419239eaf12447b68b293d1c1d15294e45bca2344dea4a9da66fba7582cd",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1089259,
-          "sha256": "0aacd5847f927fe058de40f34f09ba4676acafe9d3e3d6c4228e46a474ed8744",
+          "size": 1089708,
+          "sha256": "144f419239eaf12447b68b293d1c1d15294e45bca2344dea4a9da66fba7582cd",
           "executable": false
         },
         {
diff --git a/tests/test_install_tui.py b/tests/test_install_tui.py
index 2d8b51fee..a9bcdef79 100644
--- a/tests/test_install_tui.py
+++ b/tests/test_install_tui.py
@@ -6077,6 +6077,26 @@ class EveryCardSetupGoesToItsCard(unittest.TestCase):
                         self.assertNotIn(card, install.mounted_cards_of(setup.name,
                                                                         setup.plat))
 
+    def test_a_games_part_named_by_its_bios_folder_is_its_card(self):
+        """AmberELEC and EmuELEC write bios/ below their games part, as
+        RetroDECK below its folder. Their BIOS folder named got bios/bios
+        on a card not started once, and was refused on one started."""
+        for setup in self.setups:
+            if setup.name not in install._GAMES_PART_CARDS:
+                continue
+            started = _card_from_rules(self.root / setup.name / "started", setup)
+            blank = self.root / setup.name / "blank"
+            (blank / "bios").mkdir(parents=True)
+            for card in (started, blank):
+                with self.subTest(system=setup.name, card=card.name):
+                    choice = install.card_choice(setup.name, setup.plat, card / "bios")
+                    self.assertEqual((choice.refused, choice.folder), ("", card))
+            # A folder named bios holding bios/ is a card's root, as named.
+            nested = self.root / setup.name / "bios"
+            (nested / "bios").mkdir(parents=True)
+            self.assertEqual(install.card_choice(setup.name, setup.plat, nested).folder,
+                             nested)
+
     def test_a_blank_drive_is_refused_where_the_card_always_names_its_system(self):
         blank = self.root / "BLANK"
         blank.mkdir()
diff --git a/wiki/installer.md b/wiki/installer.md
index 35bd85390..f7793f1a4 100644
--- a/wiki/installer.md
+++ b/wiki/installer.md
@@ -1256,7 +1256,9 @@ Under WSL a drive letter (`D:`, `D:\`) is that Windows drive, typed or given
 to `--dest`, `--from`, `--from-pack`, `--save-dir` and `--cores-dir`, and the
 screens write the folder `D:\BIOS`. Without questions (`--no-input`) the
 run stops with a `--dest` example. A `--dest` that is a folder inside a MinUI
-card (its `Bios/`) is refused with the root to name instead. A refused
+card (its `Bios/`) is refused with the root to name instead. AmberELEC
+and EmuELEC write `bios/` below their games part: their `bios` folder named
+with `--dest` stands for the games part, as RetroDECK's for its folder. A refused
 `--dest` ends with code 1 and an `error` event (`stage` `detect`). On Android a forced `--platform retroarch` falls back to
 `<shared storage>/RetroArch/system` instead, a home directory there belonging
 to Termux rather than to the frontend. Pass `--dest` to say where instead of