How does oppo r 15 forcibly restore the factory settings?

You can go to "settings > system settings (other settings) > reset the phone (restore the phone)" and clear the corresponding content according to the options prompted by the phone.

(If the phone has a screen lock password, you need to enter the screen lock password for verification before you can clear the phone data. )

Restore wireless settings: only restore wireless LAN, Bluetooth and mobile data networks.

Restore only system settings: Restore only system settings (all system settings in the settings).

Clear downloaded apps and app data: Clear downloaded apps and app data (keep music, photos and other data).

Erase all data completely: Erase all data (including photos and music) in the mobile phone and restore the system settings.

Clear mobile phone contacts and call records: only clear mobile phone contacts and call records, and keep SIM card contacts.

Clear SMS and MMS: only clear SMS and MMS, and keep SIM card SMS.

Tips:

① Pay attention to the backup of mobile phone contacts, text messages, photos and applications before returning to the factory to avoid the loss of important data.

② if you have previously backed up the data through the functions of "settings > system settings (other settings) > data backup and migration (backup and recovery)", it is recommended that you copy the data to an external memory or computer for saving.

③ Because Android 12 system has strengthened the protection mechanism of application data and user privacy, all mobile phones in Android 12 system have cancelled the function of "clearing downloaded applications and application data" to reset the mobile phone.

If you need to clear the data of an application, you can do it in the following ways: "Settings >; (Application) > Application Management > (Application List) > ":"or "_" in the upper right corner > Show system programs >; Select "Apply > Storage Occupancy > Clear Data" or "Long press the desktop application icon >; Application information (details) > storage occupancy > clear data ".