: The serial number is stored within the M1 chip itself and the M1 ROM .
Before diving into the technicalities, it's important to understand the legitimate reasons someone might need to modify a Mac's serial number: macbook m1 change serial number
: Improperly rewriting firmware can make the MacBook unbootable, requiring DFU mode recovery via another Mac and Apple Configurator Feature Loss : The serial number is stored within the
Every time an M1 MacBook boots up, updates macOS, or connects to the internet, it verifies its hardware identity with Apple's activation servers. If the system detects a manipulated or spoofed serial number, the device will fail cryptographic verification. This results in a bricked system or a permanent lock screen. 3. Tightly Integrated Components This results in a bricked system or a permanent lock screen
Many users look into changing serial numbers to bypass Mobile Device Management (MDM) profiles or Activation Locks on used MacBooks. Apple Silicon handles Activation Lock at the server level based on the M1 hardware UID. Changing a local identifier—even if it were possible—will not remove a server-side lock. 4. Malware and Scams
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 :
If you see online forums, sketchy software downloads, or hardware modification services claiming they can change your M1 serial number, exercise extreme caution.