- First please power off the phone.
- Next press and hold together Volume Down + Power button until the phone vibrate once.
- Then realese quickly Volume down and press Volume up and you will see a new menu on screen.
- Now use Volume buttons to select option "Recovery".
- After that from the Recovery Mode menu choose "Wipe data/factory reset", using Volume buttons to scroll to options, and Menu button to confirm.
- Accept operation "yes - delete all data" with Menu key.
- Afterwards select option "reboot system now".
Hard Reset will erase all of your data
All described operations you are doing at your own risk.