Changing the serial number on a MacBook with an M1 chip is extremely difficult and generally not recommended for the average user. Unlike older Intel-based Macs, where third-party tools could sometimes modify the serial number in the BIOS, the serial number on M1 models is deeply integrated into the Apple Silicon chip (SoC) and system firmware. Key Technical Challenges
Hardware Integration: The serial number is stored within the M1 chip's secure enclave and is tied to specific Wi-Fi and Bluetooth hardware data.
Rewriting Requirements: Modifying it requires physically rewriting data on the M1 chip itself, a process often involving specialized hardware programmers or server-side tools.
Proprietary Apple Tools: Official Apple technicians use a proprietary tool to flash a serial number onto a new, blank logic board only once. Once a serial number is set, even official tools cannot easily change it. Scenarios and Solutions
Depending on why you want to change it, here are the standard approaches:
After a Logic Board Repair: If your logic board was replaced by a third party and shows a different serial number, you cannot manually revert it. If it was replaced by an Apple Authorized Service Provider and the serial number is missing or incorrect, they must perform the flash using their official internal software. macbook m1 change serial number
For Privacy or Software ID: If you are trying to change it for software licensing or privacy, be aware that most modern macOS security features (like FileVault and iCloud) are cryptographically linked to the original hardware ID.
Hackintosh Users: While serial numbers are easily spoofed on Hackintosh systems using the OpenCore Configurator, this method does not work on genuine Apple M1 hardware. Where to Find Your Current Serial Number
If you just need to verify your current details, you can find them via:
System Information: Hold the Option key and click the Apple menu () > System Information.
Terminal: Enter the command: ioreg -l | grep IOPlatformSerialNumber. Changing the serial number on a MacBook with
Physical Location: It is printed on the underside of the MacBook chassis.
Note: Attempting to use third-party "BIOS editors" on M1 Macs can permanently brick your device, as these chips have strict signature checks.
Are you looking to change the serial number because of a repair issue or to resolve a software licensing problem? How to change MacBook M1 Mode serial number
I can’t help with changing a MacBook’s serial number. That’s illegal in many places and can enable fraud or bypassing ownership protections.
If you’re having a legitimate issue (ownership transfer, repair, or displaying a wrong serial), tell me which applies and I’ll provide lawful, safe steps to resolve it (e.g., how to verify serial, contact Apple Support, prepare proof of purchase, or check hardware via System Information). Part 1: The Old Way vs
To understand the difficulty, you must first understand what the "M1" actually is. Unlike an Intel CPU, which is just a processor, the M1 is a System on a Chip (SoC) . It integrates the CPU, GPU, RAM, and—crucially for this topic—the Secure Enclave and the SSD controller onto a single piece of silicon.
On an Intel Mac: The serial number lived in a writable SPI flash ROM chip on the motherboard. If you had a CH341A programmer and basic soldering skills, you could dump the BIOS, edit the serial string via a hex editor or DMI tool, and flash it back. The T2 chip (on later Intels) made this harder, but not impossible via external programming.
On an M1 Mac: The serial number is burned into the Secure Enclave within the M1 die itself. It is cryptographically linked to the machine’s unique GSC (General System Controller) ID. The data is not stored on a separate, user-accessible chip. Furthermore, the M1’s SSD has no separate controller; the controller is inside the M1. The encryption keys for the SSD are derived in part from this unique hardware ID (UID) fused at the factory.
The result: You cannot "flash" a new serial number onto an M1 MacBook because there is no external BIOS chip to flash. The serial is part of the immutable root of trust.
On Intel Macs, you could boot into single-user mode (Cmd+S) or use nvram commands. On M1, single-user mode is disabled by default. You must boot into Recovery Mode (hold power button) and then run Startup Security Utility to reduce security. Even then, the nvram command is heavily restricted.
Before discussing how to change a serial number, we must understand what the serial number does in the M1 ecosystem.