How to enter Oppo R1S Recovery Mode and Hard reset.
- Turn off the device
- Press and hold Volume Up key + Power Key
- Release all key when you see Android System Recovery
Hard reset Oppo R1S
- In Recovery Mode select wipe data / factory reset
- press Power key to confirm
- select Yes — delete all user data, press Power key to confirm
- select Reboot system now to finish hard reset
Warning! If you perform a hard reset, make sure to back up important data.