: If a logic board is replaced by an [Apple Authorized Service Provider](https://support.apple.com/en-ph/102869), they use proprietary internal software to "tattoo" the original serial number onto the new board once. This is a one-time process and cannot be reversed or altered by the user. Why You Might See "Serial Number Unavailable"
. While Intel Macs often allowed for serial changes via software tools or BIOS modifications, M-series Macs integrate this identifier into the Secure Enclave and hardware-level serialization. Overview of Changing M1 Serial Numbers Difficulty Level macbook m1 change serial number
Hold the Option key and click the Apple menu () > System Information . : If a logic board is replaced by
: iMessage, FaceTime, and iCloud rely on a valid, Apple-signed serial number. Using a "fake" or "duplicate" number will likely result in these services being blocked. While Intel Macs often allowed for serial changes
Software like or UTM allows some configuration, but macOS guest support on M1 is extremely limited.
If you're experiencing issues with your MacBook's serial number, I recommend:
Please keep in mind that modifying a device's serial number can be against Apple's terms of service and might lead to unforeseen issues. If you're unsure about the best course of action, I recommend consulting with Apple support or a trusted authorized service provider.