I understand you're looking to change the serial number on an M1 MacBook. However, I need to give you a clear warning first: changing a Mac's serial number is illegal in most jurisdictions unless you are the original owner repairing a logic board with a replacement that requires serialization (e.g., Apple-authorized repair). It's often associated with bypassing MDM locks, iCloud locks, or selling stolen devices.
On an M1 Mac, the serial number is burned into multiple fused, read-only areas of the chip, including: macbook m1 change serial number
Changing the serial number on a MacBook with an M1 chip (Apple Silicon) is significantly more difficult than on older Intel-based models and is generally considered impossible for a standard user I understand you're looking to change the serial