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 ?
In OPPO's ecosystem, official unlocking often involves obtaining a file specific to the device. The "Serial is not match" error typically occurs because: the serial is not match fastboot unlock verify fail oppo
Here is a comprehensive guide on why this happens and how to resolve it. What Causes This Error? If there is no official Deep Testing APK