: If your logic board was replaced by Apple Support or an authorized provider and the serial number is now "Unavailable" or "Blank," they must use a proprietary Apple tool (often called a "Blank Board Serializer") to flash the original serial number. This tool is generally not available to the public.
If you have a legitimate need for a serial number change (like a repair error), your best and only safe path is through an macbook m1 change serial number