Do not use generic fastboot unlock commands. Follow Oppo’s approved process:
The guide had said: "Don't worry about the serial mismatch. Just force flash." the serial is not match fastboot unlock verify fail oppo
This error typically occurs when the deep testing (Unlock Review) process hasn’t been officially approved, or there is a mismatch between your device’s serial number and the unlock token provided by the server. Do not use generic fastboot unlock commands
To break the cycle, Alex followed these community-tested steps: Force Bootloader Mode : Instead of the standard button combo, Alex used the on a computer. By typing adb shell reboot bootloader and F series.
Last updated: 2025 – applies to ColorOS 12/13/14 and OPPO Find, Reno, A, and F series.