Disabling the app via Safe Mode often only stops the visual effects (like brightness locking or video loops) but might not release the phone's core "Retail State". This is often a temporary fix that resets on reboot.
Hold the and Volume Down buttons together, then connect the phone to the PC via USB. This boots the device into BROM or EDL mode. oppo demo mode remove
If the demo mode is locked by a password or prevents setting changes, a hard reset is necessary. Power Off : Turn off the device completely. Disabling the app via Safe Mode often only
If an unlock screen appears, enter one of the 6-digit codes mentioned above. Method 3: ADB Command (Advanced) oppo demo mode remove