| Error Message | Likely Cause | Fix | |---------------|--------------|-----| | “No update files found” | Wrong folder structure or file system | Reformat USB as exFAT; check folder naming | | “Update interrupted” | USB power drop or ignition off | Restart update; use battery charger | | “Signature invalid” | Corrupt download or mismatch VIN | Redownload map package; verify VIN | | “Not enough storage” | Map region larger than free space | Remove old map data via diagnostic tool (dealership) | | “Update takes too long” | USB 2.0 drive or many small files | Use USB 3.1 drive with fast random read |
For vehicles with iDrive 7.0 or newer (MGU head unit), OTA updates are incremental: bmw download map update