M1 Change Serial Number ~upd~: Macbook

Hour four. The soldering iron stayed cold; this was a war of bits, not metal. He found the offset—the specific coordinate in the deep system firmware where the serial lived. With a steady breath, he typed the command to "spoof" the handshake.

That said, if you have a (like replacing the logic board yourself on an otherwise dead machine and needing to match the original serial for software compatibility), here's the technical reality for the M1 MacBook : macbook m1 change serial number

There are several reasons why someone might want to change the serial number on their M1 MacBook: Hour four