If you see you have three options:
Depending on the cause, users and technicians often use the following methods to resolve the issue: If you see you have three options: Depending
If you absolutely must unlock your Oppo, your only guaranteed solution is to check XDA Forums for a leaked "Deep Test Engineering" APK specific to your exact model number (e.g., CPH2345). No universal token exists. Unlike the "wild west" of some Android manufacturers
That final line, is the key to the puzzle, and the source of your frustration. Unlike the "wild west" of some Android manufacturers where unlocking a bootloader is as simple as tapping a toggle in Developer Options, Oppo plays by a different, stricter set of rules. You try again
Your heart sinks. You double-check the command. You try again. Same result. For users of and its sub-brand Realme (and occasionally OnePlus devices on ColorOS), this error has become the ultimate gatekeeper, locking bootloaders tighter than Fort Knox.
This effectively blocks access to Fastboot mode, preventing users from flashing custom firmware, rooting, or repairing system software. Understanding the Error