If you are seeing this error while trying to enter Fastboot or unlock your bootloader, try these community-verified methods:

Upgrading to newer Android versions (like Android 11 or 13) may block standard bootloader entry. Unauthorized ROMs:

If your phone is completely bricked, looping, or unable to enter recovery mode, you must bypass the bootloader entirely. MediaTek (MTK) powered OPPO devices can be addressed through the , which executes before the faulty bootloader even loads.

Look under the or Android section for a yellow warning triangle. Right-click the item and select Update Driver .

You are using a version of the Unlock Tool (Deep Testing APK) that doesn’t match your region or Android version.

Firmly press and click the and Power buttons multiple times to ensure they are clicking freely and not stuck.

The error is often linked to Oppo's use of a unique . The device will only accept certain verified commands or debugging tools that carry this special key. Without the right key or the proper approval from Oppo, any attempt to enter fastboot for unlocking will be blocked.

A major hurdle in the official process is the software version. The official 'Deep Testing' app has strict software version requirements. For many newer devices running ColorOS 12 or higher, the app will fail to install or will crash due to signature conflicts.