diff --git a/system/manager/manager.py b/system/manager/manager.py
index 4a43d4553..abf1836df 100755
--- a/system/manager/manager.py
+++ b/system/manager/manager.py
@@ -95,59 +95,60 @@ def manager_init() -> None:
   # Legacy Bolt fingerprint migration after branch consolidation
   bolt_source_branch_file = "/data/media/0/starpilot_source_branch"
   bolt_fingerprint_migration_flag_file = "/data/media/0/frogpilot_bolt_fingerprint_migrated.flag"
-  source_branch = ""
-  try:
-    if os.path.exists(bolt_source_branch_file):
-      with open(bolt_source_branch_file, encoding="utf-8") as f:
-        source_branch = f.read().strip()
-  except OSError:
-    cloudlog.exception("failed reading StarPilot source branch file")
+  if not os.path.exists(bolt_fingerprint_migration_flag_file):
+    source_branch = ""
+    try:
+      if os.path.exists(bolt_source_branch_file):
+        with open(bolt_source_branch_file, encoding="utf-8") as f:
+          source_branch = f.read().strip()
+    except OSError:
+      cloudlog.exception("failed reading StarPilot source branch file")
 
-  migration_branch = source_branch or build_metadata.channel
-  replacements = {}
-  if migration_branch in {"TorqueTune", "TorquePedal"}:
-    replacements = {
-      "CHEVROLET_BOLT_EUV": "CHEVROLET_BOLT_ACC_2022_2023",
-      "CHEVROLET_BOLT_CC": "CHEVROLET_BOLT_CC_2022_2023",
-    }
-  elif migration_branch in {"TotallyTune", "StarPilot-2017", "StarPilot 2017"}:
-    replacements = {
-      "CHEVROLET_BOLT_CC": "CHEVROLET_BOLT_CC_2017",
-    }
-  elif migration_branch in {"StarPilot"}:
-    replacements = {
-      "CHEVROLET_BOLT_CC": "CHEVROLET_BOLT_CC_2019_2021",
+    migration_branch = source_branch or build_metadata.channel
+    replacements = {}
+    if migration_branch in {"TorqueTune", "TorquePedal"}:
+      replacements = {
+        "CHEVROLET_BOLT_EUV": "CHEVROLET_BOLT_ACC_2022_2023",
+        "CHEVROLET_BOLT_CC": "CHEVROLET_BOLT_CC_2022_2023",
+      }
+    elif migration_branch in {"TotallyTune", "StarPilot-2017", "StarPilot 2017"}:
+      replacements = {
+        "CHEVROLET_BOLT_CC": "CHEVROLET_BOLT_CC_2017",
+      }
+    elif migration_branch in {"StarPilot"}:
+      replacements = {
+        "CHEVROLET_BOLT_CC": "CHEVROLET_BOLT_CC_2019_2021",
+      }
+
+    migrated_values = []
+    if replacements:
+      for param_key in ("CarModel", "CarModelName"):
+        current_value = params.get(param_key, encoding='utf-8')
+        normalized_value = current_value[4:] if current_value is not None and current_value.startswith("CAR.") else current_value
+        if normalized_value in replacements:
+          new_value = replacements[normalized_value]
+          params.put(param_key, new_value)
+          params_cache.put(param_key, new_value)
+          migrated_values.append(f"{param_key}: {current_value} -> {new_value}")
+
+    if migrated_values:
+      cloudlog.info(f"migrated legacy bolt fingerprint values from branch '{migration_branch}' (source='{source_branch}'): {', '.join(migrated_values)}")
+
+    # Keep Bolt display label aligned with live fingerprint selection
+    bolt_models = {
+      "CHEVROLET_BOLT_EUV",
+      "CHEVROLET_BOLT_CC",
+      "CHEVROLET_BOLT_ACC_2022_2023",
+      "CHEVROLET_BOLT_CC_2022_2023",
+      "CHEVROLET_BOLT_CC_2019_2021",
+      "CHEVROLET_BOLT_CC_2017",
     }
+    if (params.get("CarModel", encoding='utf-8') or "") in bolt_models:
+      params.remove("CarModelName")
+      params_cache.remove("CarModelName")
 
-  migrated_values = []
-  if replacements:
-    for param_key in ("CarModel", "CarModelName"):
-      current_value = params.get(param_key, encoding='utf-8')
-      normalized_value = current_value[4:] if current_value is not None and current_value.startswith("CAR.") else current_value
-      if normalized_value in replacements:
-        new_value = replacements[normalized_value]
-        params.put(param_key, new_value)
-        params_cache.put(param_key, new_value)
-        migrated_values.append(f"{param_key}: {current_value} -> {new_value}")
-
-  if migrated_values:
-    cloudlog.info(f"migrated legacy bolt fingerprint values from branch '{migration_branch}' (source='{source_branch}'): {', '.join(migrated_values)}")
-
-  # Keep Bolt display label aligned with live fingerprint selection
-  bolt_models = {
-    "CHEVROLET_BOLT_EUV",
-    "CHEVROLET_BOLT_CC",
-    "CHEVROLET_BOLT_ACC_2022_2023",
-    "CHEVROLET_BOLT_CC_2022_2023",
-    "CHEVROLET_BOLT_CC_2019_2021",
-    "CHEVROLET_BOLT_CC_2017",
-  }
-  if (params.get("CarModel", encoding='utf-8') or "") in bolt_models:
-    params.remove("CarModelName")
-    params_cache.remove("CarModelName")
-
-  with open(bolt_fingerprint_migration_flag_file, "w") as f:
-    f.write(migration_branch or "unknown")
+    with open(bolt_fingerprint_migration_flag_file, "w") as f:
+      f.write(migration_branch or "unknown")
 
   # One-time migration to align FrogPilot defaults after install
   frogpilot_migration_flag_file = "/data/media/0/frogpilot_migrated.flag"