Try the code *#8778# in the dialer to initiate a factory reset.
If the software is a retail "live demo" version, it may require a technician's code to deactivate. Open the app. oppo demo mode remove
Enter Developer Options, locate the "Demo Mode" entry, and disable it. This method works for many OPPO models, including the Reno6, Reno4, and A-series. Try the code *#8778# in the dialer to
Technicians often use specific APKs like or Oppo Demo Unlock Tool to bypass deeper retail locks. locate the "Demo Mode" entry