diff --git a/install.ps1 b/install.ps1
index f12f5ffb2..d53d32866 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 = "ec117f8ed92e101b1adc51b1f07bf002840fb8e36c4c492617e1b48c47c6ee92"
+    $defaultInstallSha256 = "e818db12a40eb26da591c605351349983861dc35e7cdb98993bb12ee1922d91b"
     $maximumInstallerBytes = 2MB
     $installerExit = 0
     $installer = if ($PSScriptRoot) { Join-Path $PSScriptRoot "install.py" } else { $null }
diff --git a/install.py b/install.py
index 546d9d04f..4c66501ff 100644
--- a/install.py
+++ b/install.py
@@ -1466,8 +1466,10 @@ _BOARD_SOURCES: dict[str, tuple[str, str]] = {
 # target lists are named for the board files (configs/knulli-rk3566.board),
 # and the arch file for the TARGET flag the board sets. knulli-rk3566.board
 # sets BR2_PACKAGE_BATOCERA_TARGET_RK3568, which knulli-system.mk:22-23
-# (20260511) writes as rk3568.
+# (20260511) writes as rk3568. batocera-zen3.board sets TARGET_ZEN3, which
+# batocera-system.mk:56-57 (batocera-43.1) writes as x86-64-v3.
 _BOARD_NAMES: dict[str, dict[str, str]] = {
+    "batocera": {"x86-64-v3": "zen3"},
     "knulli": {"rk3568": "rk3566"},
 }
 
diff --git a/install.sh b/install.sh
index 61669c012..e62e835c6 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="ec117f8ed92e101b1adc51b1f07bf002840fb8e36c4c492617e1b48c47c6ee92"
+DEFAULT_INSTALL_SHA256="e818db12a40eb26da591c605351349983861dc35e7cdb98993bb12ee1922d91b"
 MAX_INSTALLER_BYTES=2097152
 
 cleanup() {
diff --git a/install/launchers/index.json b/install/launchers/index.json
index 4d17f4026..371e49d0c 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": 1090336,
-          "sha256": "ec117f8ed92e101b1adc51b1f07bf002840fb8e36c4c492617e1b48c47c6ee92",
+          "size": 1090483,
+          "sha256": "e818db12a40eb26da591c605351349983861dc35e7cdb98993bb12ee1922d91b",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1143963,
-        "sha256": "c99324398d6e3746ef65b3cf491c30defae5556664bb4e7cca1675c3d1c2a444"
+        "size": 1144110,
+        "sha256": "5d9347427326038bf925f778d724f87cdafca03e50017123af3cd0eb9939cb7c"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1090336,
-          "sha256": "ec117f8ed92e101b1adc51b1f07bf002840fb8e36c4c492617e1b48c47c6ee92",
+          "size": 1090483,
+          "sha256": "e818db12a40eb26da591c605351349983861dc35e7cdb98993bb12ee1922d91b",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1090336,
-          "sha256": "ec117f8ed92e101b1adc51b1f07bf002840fb8e36c4c492617e1b48c47c6ee92",
+          "size": 1090483,
+          "sha256": "e818db12a40eb26da591c605351349983861dc35e7cdb98993bb12ee1922d91b",
           "executable": false
         },
         {
diff --git a/tests/test_install.py b/tests/test_install.py
index a01203c32..079d4d45b 100644
--- a/tests/test_install.py
+++ b/tests/test_install.py
@@ -5414,6 +5414,15 @@ class BatoceraAndKnulliByWhatTheirBuildsWrite(unittest.TestCase):
                 if board:
                     self.assertIn(board, targets)
 
+    def test_a_batocera_zen3_board_narrows_to_its_target(self):
+        """batocera.arch says x86-64-v3 on a zen3 image, which no target
+        list names: the run installed the files of every board."""
+        arch = Path(_tempdir(self)) / "batocera.arch"
+        arch.write_text("x86-64-v3")
+        with unittest.mock.patch.dict(install._BOARD_SOURCES,
+                                      {"batocera": ("file", str(arch))}):
+            self.assertEqual(install.detect_board("batocera"), "zen3")
+
     def test_each_board_name_is_a_published_target(self):
         for plat, names in install._BOARD_NAMES.items():
             targets = json.loads((REPO_ROOT / "install" / "targets" / f"{plat}.json")