diff --git a/install.ps1 b/install.ps1
index 7a8b8a040..32699e0d1 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 = "9dcac77739d3cf609879117fb16bcf798c4b6432b8647cf49dbef52d6650adeb"
+    $defaultInstallSha256 = "68d93a9905c324bc378ead0c0a7cbbecaf47a3c113265cb9f7c40ad40338b9a3"
     # The pin above refuses any changed byte: this cap only stops a body that
     # cannot be the installer (a sign-in portal's page) before it is hashed.
     $maximumInstallerBytes = 8MB
diff --git a/install.py b/install.py
index 937bf30a9..0f8a6d6c7 100644
--- a/install.py
+++ b/install.py
@@ -4237,7 +4237,7 @@ def _validate_manifest(data: object, plat: str) -> dict:
     ):
         raise ValueError("manifest total_omitted does not match omitted_files")
 
-    for field in ("core_names", "system_cores", "system_names"):
+    for field in ("core_names", "downloaded_cores", "system_cores", "system_names"):
         mapping = data.get(field)
         if mapping is None:
             continue
@@ -4828,18 +4828,28 @@ def _filter_by_target(
     return result
 
 
-def designated_cores(manifest: dict, names: list[str]) -> set[str]:
+def designated_cores(
+    manifest: dict, names: list[str], target: str | None = None
+) -> set[str]:
     """The cores a list of names designates, the way the pack builder reads it.
 
     A target list, or a core found installed, names a core the buildbot's
     way (`mednafen_psx`), and a file names the profile that reads it
-    (`beetle_psx`). `core_names` gives each profile its other names.
+    (`beetle_psx`). `core_names` gives each profile its other names. A core
+    only the platform's RetroArch downloader brings runs on the boards
+    `downloaded_cores` gives it: Batocera's bcm2711 list names its own
+    amiberry, and the buildbot's amiberry core is no download there.
     """
     wanted = set(names)
     chosen = set(wanted)
     for profile, aliases in (manifest.get("core_names") or {}).items():
         if wanted.intersection(aliases):
             chosen.add(profile)
+    if target is not None:
+        chosen -= {
+            profile for profile, boards in (manifest.get("downloaded_cores") or {}).items()
+            if target not in boards
+        }
     return chosen
 
 
@@ -4849,6 +4859,7 @@ def narrow_to_cores(
     files: list[dict] | None = None,
     omitted: list[dict] | None = None,
     declared_by_info: Collection[str] = (),
+    target: str | None = None,
 ) -> tuple[list[dict], list[dict]]:
     """Keep what the named cores read, as a pack built for them carries.
 
@@ -4859,9 +4870,10 @@ def narrow_to_cores(
     way to the first named core claiming its destination. A manifest without
     the two maps keeps the platform's list whole and matches cores by name.
     A destination in `declared_by_info`, what the .info of an installed core
-    no profile describes declares, stays whatever is named.
+    no profile describes declares, stays whatever is named. `target` is the
+    board the names are the list of.
     """
-    cores = designated_cores(manifest, names)
+    cores = designated_cores(manifest, names, target)
     reach = manifest.get("system_cores") or {}
     info_dests = {dest.casefold() for dest in declared_by_info}
 
@@ -16175,7 +16187,8 @@ def _install(args: argparse.Namespace, real_stdout: TextIO) -> None:
             else:
                 before = len(files)
                 files, omitted_files = narrow_to_cores(
-                    manifest, target_info["cores"], files, omitted_files
+                    manifest, target_info["cores"], files, omitted_files,
+                    target=target,
                 )
                 print(f"  Filtered {before} to {len(files)} files for target {target}")
 
diff --git a/install.sh b/install.sh
index 2723cd262..88f7d3b79 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="9dcac77739d3cf609879117fb16bcf798c4b6432b8647cf49dbef52d6650adeb"
+DEFAULT_INSTALL_SHA256="68d93a9905c324bc378ead0c0a7cbbecaf47a3c113265cb9f7c40ad40338b9a3"
 # The pin above refuses any changed byte: this cap only stops a body that
 # cannot be the installer (a sign-in portal's page) before it is hashed.
 MAX_INSTALLER_BYTES=8388608
diff --git a/install/launchers/index.json b/install/launchers/index.json
index a7757974e..eec6fb563 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": 1150418,
-          "sha256": "9dcac77739d3cf609879117fb16bcf798c4b6432b8647cf49dbef52d6650adeb",
+          "size": 1151002,
+          "sha256": "68d93a9905c324bc378ead0c0a7cbbecaf47a3c113265cb9f7c40ad40338b9a3",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1204043,
-        "sha256": "24a025696054f5a9371eab36b0f43332ea1cd3c35a706619a6ddc2559c4aa220"
+        "size": 1204627,
+        "sha256": "45d6a1c8ccdf2309783c391be51e274939890b25c5b78ee10b435155a934c271"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1150418,
-          "sha256": "9dcac77739d3cf609879117fb16bcf798c4b6432b8647cf49dbef52d6650adeb",
+          "size": 1151002,
+          "sha256": "68d93a9905c324bc378ead0c0a7cbbecaf47a3c113265cb9f7c40ad40338b9a3",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1150418,
-          "sha256": "9dcac77739d3cf609879117fb16bcf798c4b6432b8647cf49dbef52d6650adeb",
+          "size": 1151002,
+          "sha256": "68d93a9905c324bc378ead0c0a7cbbecaf47a3c113265cb9f7c40ad40338b9a3",
           "executable": false
         },
         {
diff --git a/schemas/install-manifest.schema.json b/schemas/install-manifest.schema.json
index ea313b6b8..51eaf7f50 100644
--- a/schemas/install-manifest.schema.json
+++ b/schemas/install-manifest.schema.json
@@ -130,6 +130,18 @@
         "uniqueItems": true
       }
     },
+    "downloaded_cores": {
+      "description": "Each core only the platform's RetroArch core downloader brings, with the boards and board aliases whose downloader offers it. install.py --target keeps the files of such a core on those boards only.",
+      "type": "object",
+      "additionalProperties": {
+        "type": "array",
+        "items": {
+          "type": "string",
+          "minLength": 1
+        },
+        "uniqueItems": true
+      }
+    },
     "system_cores": {
       "description": "Each platform system with the cores whose presence keeps it. A system absent here is kept whatever cores are available.",
       "type": "object",
diff --git a/scripts/common.py b/scripts/common.py
index 4d8ab742a..f11f86c44 100644
--- a/scripts/common.py
+++ b/scripts/common.py
@@ -6,7 +6,7 @@ and file resolution - eliminates DRY violations across scripts.
 
 from __future__ import annotations
 
-from collections.abc import Callable, Iterable, Mapping
+from collections.abc import Callable, Collection, Iterable, Mapping
 from collections import Counter
 
 import argparse
@@ -3230,9 +3230,30 @@ def resolve_platform_cores(
     Alias profiles are always excluded (they point to another profile).
     If target_cores is provided, result is intersected with it.
     """
+    result, downloaded_only = _platform_profiles(config, profiles)
+    if target_cores is not None:
+        result = result & designated_profiles(profiles, target_cores)
+        result -= {
+            profile for profile, names in downloaded_only.items()
+            if not downloadable_on(target_cores, names)
+        }
+    return result
+
+
+def downloaded_only_profiles(
+    config: dict, profiles: dict[str, dict]
+) -> dict[str, frozenset[str]]:
+    """The profiles a platform reaches only through its RetroArch core
+    downloader, each with the installable names that reach it."""
+    return _platform_profiles(config, profiles)[1]
+
+
+def _platform_profiles(
+    config: dict, profiles: dict[str, dict]
+) -> tuple[set[str], dict[str, frozenset[str]]]:
     cores_config = config.get("cores")
     platform_key = str(config.get("_key") or "")
-    downloaded_only: dict[str, str] = {}
+    downloaded_only: dict[str, set[str]] = {}
     # The builds the platform compiles itself, by the names they answer to.
     # Such a name means that build there, and another revision of the same
     # project is not what the platform runs: ROCKNIX and RetroPie build only
@@ -3323,9 +3344,11 @@ def resolve_platform_cores(
         # A core reached only through the RetroArch downloader runs on the
         # boards whose downloader offers it: Batocera's x86_64 RetroArch
         # installs the amiberry core, its armv7 and aarch64 boards cannot.
+        # Every installable name counts: Batocera's x86_64 downloader offers
+        # nside_sfc_balanced, not the higan_sfc_balanced it also lists.
         for c in config.get("installable_cores") or []:
             for profile in libretro_builds(c) - dual - result:
-                downloaded_only.setdefault(profile, str(c))
+                downloaded_only.setdefault(profile, set()).add(str(c))
         result |= dual | set(downloaded_only)
         # Support "all_libretro" as a list element: combines all libretro
         # profiles with explicitly listed standalone cores (e.g. RetroDECK
@@ -3343,13 +3366,7 @@ def resolve_platform_cores(
             and not p.get("built_by")
         }
 
-    if target_cores is not None:
-        result = result & designated_profiles(profiles, target_cores)
-        result -= {
-            profile for profile, c in downloaded_only.items()
-            if not downloadable_on(target_cores, c)
-        }
-    return result
+    return result, {p: frozenset(names) for p, names in downloaded_only.items()}
 
 
 @functools.lru_cache(maxsize=1)
@@ -3362,14 +3379,18 @@ def _retroarch_target_sets() -> tuple[frozenset[str], ...]:
     )
 
 
-def downloadable_on(target_cores: set[str], name: str) -> bool:
-    """Whether a board's core set holds a RetroArch download list offering `name`.
+def downloadable_on(target_cores: set[str], names: Collection[str]) -> bool:
+    """Whether a board's core set holds a RetroArch download list offering
+    one of `names`.
 
     A board with a downloader carries a whole RetroArch targets entry in its
     set (load_target_config, `downloads`), a board without one only what it
     builds.
     """
-    return any(name in found and found <= target_cores for found in _retroarch_target_sets())
+    return any(
+        found <= target_cores and not found.isdisjoint(names)
+        for found in _retroarch_target_sets()
+    )
 
 
 def unresolved_platform_cores(config: dict, profiles: dict[str, dict]) -> set[str]:
diff --git a/scripts/generate_pack.py b/scripts/generate_pack.py
index b62ce5a06..fd3a39032 100644
--- a/scripts/generate_pack.py
+++ b/scripts/generate_pack.py
@@ -86,6 +86,9 @@ from common import (
     ProfileSelectionError,
     core_system_dirs,
     declared_root,
+    downloadable_on,
+    downloaded_only_profiles,
+    list_available_targets,
     entry_serves_systems,
     entry_system_ids,
     platform_layouts,
@@ -5291,6 +5294,9 @@ def generate_manifest(
             omitted_by_destination.values(), key=lambda entry: entry["dest"]
         ),
         "core_names": core_names,
+        **({"downloaded_cores": downloaded} if (downloaded := _downloaded_cores(
+            config, emu_profiles, core_names, platforms_dir,
+        )) else {}),
         "system_cores": system_cores,
         # The names the platform itself gives its systems (Batocera's psx),
         # which --system accepts beside the ids.
@@ -5445,6 +5451,39 @@ def _manifest_data_directories(
     return trees
 
 
+def _downloaded_cores(
+    config: dict,
+    profiles: dict[str, dict],
+    core_names: dict[str, list[str]],
+    platforms_dir: str,
+) -> dict[str, list[str]]:
+    """The cores only the platform's RetroArch downloader brings, each with
+    the boards, aliases included, whose downloader offers it.
+
+    A target list names the board's standalone amiberry and the buildbot's
+    amiberry core alike, so the installer cannot tell from the name whether
+    the board reaches the core. `resolve_platform_cores` decides it, and
+    `install.py --target` reads its answer here.
+    """
+    reached = {
+        profile: names
+        for profile, names in downloaded_only_profiles(config, profiles).items()
+        if profile in core_names
+    }
+    if not reached:
+        return {}
+    platform = str(config.get("_key") or "")
+    boards: dict[str, list[str]] = {profile: [] for profile in reached}
+    for target in list_available_targets(platform, platforms_dir):
+        cores = load_target_config(platform, target["name"], platforms_dir)
+        if cores is None:
+            continue
+        for profile, names in reached.items():
+            if downloadable_on(cores, names):
+                boards[profile] += [target["name"], *target.get("aliases", [])]
+    return {profile: sorted(names) for profile, names in sorted(boards.items())}
+
+
 def _manifest_core_index(
     config: dict,
     profiles: dict[str, dict],
diff --git a/tests/test_install_cores.py b/tests/test_install_cores.py
index a4e3c88ab..6ff2c2285 100644
--- a/tests/test_install_cores.py
+++ b/tests/test_install_cores.py
@@ -113,6 +113,38 @@ class NarrowToCores(unittest.TestCase):
         )
 
 
+class ACoreOnlyTheDownloaderBrings(unittest.TestCase):
+    """Batocera builds amiberry standalone on every board, and only its
+    x86_64 RetroArch downloads the amiberry core: both answer to amiberry
+    in a board's core list. The builder reads the downloader's reach
+    (resolve_platform_cores) and the list carries it in downloaded_cores."""
+
+    MANIFEST = {
+        "core_names": {"amiberry": [], "amiberry-7": ["amiberry"]},
+        "downloaded_cores": {"amiberry": ["x86_64", "pc"]},
+        "system_cores": {"commodore-amiga": ["amiberry", "amiberry-7"]},
+        "files": [
+            {"dest": "kick31.rom", "cores": ["amiberry-7"], "systems": ["commodore-amiga"]},
+            {"dest": "roms/a4091.rom", "cores": ["amiberry"], "systems": ["commodore-amiga"]},
+        ],
+        "omitted_files": [],
+    }
+
+    def test_a_board_without_the_download_keeps_its_own_build(self):
+        files, _ = install.narrow_to_cores(self.MANIFEST, ["amiberry"], target="bcm2711")
+        self.assertEqual([f["dest"] for f in files], ["kick31.rom"])
+
+    def test_a_board_or_its_alias_with_the_download_keeps_both(self):
+        for target in ("x86_64", "pc"):
+            with self.subTest(target=target):
+                files, _ = install.narrow_to_cores(self.MANIFEST, ["amiberry"], target=target)
+                self.assertEqual([f["dest"] for f in files], ["kick31.rom", "roms/a4091.rom"])
+
+    def test_an_installed_core_is_no_board(self):
+        files, _ = install.narrow_to_cores(self.MANIFEST, ["amiberry"])
+        self.assertEqual([f["dest"] for f in files], ["kick31.rom", "roms/a4091.rom"])
+
+
 class ACoreTheListDoesNotKnow(unittest.TestCase):
     """A core newer than the list (parallel_dc, issue 87) loses nothing its .info declares."""
 
diff --git a/tests/test_install_selection.py b/tests/test_install_selection.py
index 852699169..76f488d43 100644
--- a/tests/test_install_selection.py
+++ b/tests/test_install_selection.py
@@ -1015,7 +1015,7 @@ class InstallMatchesATargetManifest(unittest.TestCase):
                 ))
                 full = self._manifest(platform)
                 built = self._manifest(platform, set(cores), target)
-                files, omitted = install.narrow_to_cores(full, cores)
+                files, omitted = install.narrow_to_cores(full, cores, target=target)
                 # A case-insensitive platform reads one file under both
                 # spellings (BlastEm's 32X_M_BIOS.bin, PicoDrive's .BIN).
                 from common import load_platform_config
diff --git a/tests/test_target_scrapers.py b/tests/test_target_scrapers.py
index 65a90da7d..0a1bc8848 100644
--- a/tests/test_target_scrapers.py
+++ b/tests/test_target_scrapers.py
@@ -335,6 +335,42 @@ class CoreDownloaderReach(unittest.TestCase):
         self.assertIn(DUAL_MODE_PREFIX + "amiberry", standalone_set(config))
 
 
+class DownloadedCoresReachTheirBoards(unittest.TestCase):
+    """A core only the downloader brings runs where the board's downloader
+    offers one of its names, and the install list says on which boards."""
+
+    @classmethod
+    def setUpClass(cls):
+        from common import load_emulator_profiles, load_platform_config  # noqa: PLC0415
+
+        cls.profiles = load_emulator_profiles(str(REPO_ROOT / "emulators"))
+        cls.config = load_platform_config("batocera", str(REPO_ROOT / "platforms"))
+
+    def test_every_installable_name_counts(self):
+        """Batocera lists higan_sfc_balanced and nside_sfc_balanced, and the
+        buildbot offers the second: reading the first alone dropped the
+        core from x86_64."""
+        from common import load_target_config, resolve_platform_cores  # noqa: PLC0415
+
+        root = str(REPO_ROOT / "platforms")
+        x86 = load_target_config("batocera", "x86_64", root)
+        self.assertIn("higan_sfc_balanced", resolve_platform_cores(self.config, self.profiles, x86))
+        rpi4 = load_target_config("batocera", "bcm2711", root)
+        resolved = resolve_platform_cores(self.config, self.profiles, rpi4)
+        self.assertNotIn("amiberry", resolved)
+        self.assertIn("amiberry-7.1.1-332", resolved)
+
+    def test_the_list_names_the_boards_of_each_downloaded_core(self):
+        import generate_pack  # noqa: PLC0415
+
+        core_names = {"amiberry": [], "higan_sfc_balanced": ["nside_sfc_balanced"]}
+        boards = generate_pack._downloaded_cores(
+            self.config, self.profiles, core_names, str(REPO_ROOT / "platforms"))
+        self.assertEqual(set(boards), {"amiberry", "higan_sfc_balanced"})
+        self.assertIn("x86_64", boards["amiberry"])
+        self.assertNotIn("bcm2711", boards["amiberry"])
+
+
 class KnulliPerBoard(unittest.TestCase):
     """KNULLI builds per board on Batocera's model from its own tree:
     configs/knulli-*.board, package/system/knulli-system/Config.in and