Oppo - The Serial Is Not Match Fastboot Unlock Verify Fail

If successful, the error will disappear, and the bootloader will unlock.

An error within the device's partitions ( misc or bootloader partitions) can cause a failure in the hardware verification process.

Unlike Xiaomi (which allows unlocking via a simple Mi Account waiting period) or OnePlus (which used to offer fastboot oem unlock freely), Oppo requires:

Faced with the "serial is not match" error, here's a practical plan to follow:

fastboot --version

If the device encountered this error immediately after updating to a newer Android version, the updated bootloader is preventing the exploit. Downgrading the OS to an earlier stock version restores an older bootloader that lacks the stricter serial verification checks.

If there is no official Deep Testing APK for your specific model and regional firmware version, Using third-party "unlocker" software often results in a hard-bricked device because the vbmeta and signature checks remain active. Summary Checklist Is Deep Testing approved (Review Successful)? Are you using the original USB cable? Does the phone show "Fastboot Unlock" mode specifically? Have you tried both oem unlock and flashing unlock ?

Ensure your phone is running the original firmware that came with the device before attempting the unlock. Step 4: Troubleshooting the Hardware Connection