How does OPPO R9s delete all data?

Just restore the phone to the factory settings. The method for restoring the factory settings of OPPO R9S mobile phone is as follows:

First, click "Settings" on the desktop of OPPO R9S mobile phone.

2. After entering the setting interface of OPPO R9S mobile phone, select the "Other Settings" option.

Third, then find the item "Restore your mobile phone" and click Enter.

4. After entering, select "Erase all contents and settings".