How to restore the factory settings of oppo k9?

If your mobile phone needs to be restored to factory settings, (here, take the OPPO RenoAce mobile phone COIOROS11.1version as an example). You can follow the following path:

Go to "Settings > Other Settings > Restore Phone" of 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. If you forget your password, please back up the important information of your mobile phone and bring the purchase voucher to the local OPPO customer service center for processing. )

① Restore wireless settings: Only restore WLAN, Bluetooth and mobile data networks.

② Only restore system settings: only restore system settings (all system settings in the settings).

③ Clear downloaded applications and application data: Clear your downloaded applications and application data (keep music, photos and other data).

④ Clear all data completely: Clear all data (including photos and music) in the mobile phone and restore the system settings.

⑤ Clear mobile phone contacts and call records: only clear mobile phone contacts and call records, and keep SIM card contacts.

⑥ Clear SMS and MMS: only clear SMS and MMS, and keep SIM card SMS.

Tips:

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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.

Due to the different versions of OPPO mobile phone system, the operation path may be slightly different, please refer to the actual operation interface display of mobile phone.

This answer applies to all OPPO models.