If you are trying to unlock the bootloader on your Oppo device and find yourself staring at the dreaded error, you aren't alone. This specific error is a protective roadblock unique to Oppo’s ecosystem.
Once the status says "Review successful," tap "Start the in-depth test." Your phone will reboot into Fastboot mode, and the command fastboot flashing unlock should now work without the verification fail error. 2. Check for Driver Conflicts If you are trying to unlock the bootloader
Double-check that the Serial Number (SN) you provided in any unlocking tool exactly matches what is shown in . Even a single lowercase letter instead of an uppercase letter can trigger the "Serial Is Not Match" error. The "Oppo Exclusive" Problem If you are trying to unlock the bootloader