For development or custom ROMs, choose a device with an open unlock policy.

Sometimes the "Serial is not match" is a generic fallback error for a communication timeout.

Attempting to enter Fastboot without completing or receiving approval from the official "Deep Testing" unlock application.

"REWRITING SERIAL... FAILED." "ALTERNATE ROUTE: MANUAL VERIFICATION." "QUESTION: WHAT IS THE LAST THING YOU REMEMBER BEFORE YOU BOUGHT THIS PHONE?"

Connect your phone to a PC with ADB and Fastboot installed . Open a command prompt and type: adb reboot bootloader .

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