How to factory reset OPPO R9? How to wipe all data in OPPO R9? How to bypass screen lock in OPPO R9? How to restore defaults in OPPO R9?
The following tutorial shows all method of master reset OPPO R9. Check out how to accomplish hard reset by hardware keys and Android 6.0 Marshmallow settings. As a result your OPPO R9 will be as new and your MediaTek Helio P10 (MT6755) core will run faster.
BacBa - Hard Reset Oppo R1 - video
Hard Reset will erase all of your data
All described operations you are doing at your own risk.