How to enter Xiaomi HongMi Recovery Mode and Hard reset.
- Turn off the device
- Press and hold Volume Down key + Power Key
- Release all key when menu appears
- select Recovery mode with Volume Down key and confirm with Volume Up key
- Press Power key when Android logo appears then you will see Android System Recovery
Hard reset Oppo R3
- In Recovery Mode select wipe data / factory reset with Volume down key
- press Volume Up key to confirm
- select Yes — delete all user data, press Volume up 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.