How to factory reset OPPO A91? How to wipe all data in OPPO A91? How to bypass screen lock in OPPO A91? How to restore defaults in OPPO A91?
The following tutorial shows all method of master reset OPPO A91. Check out how to accomplish hard reset by hardware keys and Android 9.0 Pie settings. As a result your OPPO A91 will be as new and your MediaTek Helio P70 (MT6771V/CT) core will run faster.