1. Charge the battery 100%.
2. Turn off the phone.
3. Turn ON the device by pressing and holding the VOLUME UP key and the power key together until the phone shortly vibrates.
4. When Android system recovery menu appears, release VOLUME key.
5. Highlight wipe data/Factory reset using volume key.
6. Confirm with Power or Cancel using BACK key.
7. After hard reset is done, highlight reboot system now and confirm your selection.
Note! All data will be deleted!