Many users, mostly of Oppo devices, are having problems with demo mode.
Demo mode typically starts at random. The words “DEMO” in large red letters continue to appear on each screen, according to clients.
You can disable demo mode on your Oppo Reno 4 phone in a variety of ways by watching this video:
If using the aforementioned options doesn’t allow you to disable or turn off demo mode, I’d advise performing a factory reset.
However, before performing an industrial facility reset, make sure you backup all of the information because a reset deletes all of the data.
