Here is a guide on How To Hard Reset MyPhone A888 Duo.
Procedures:
1. Turn off your mobile device then remove your battery for 20 seconds.
2. Put the battery back.
3. Now press and hold volume up, volume down and power button.
4. Press volume up button. Then choose wipe data/ factory reset, use the Volume up and down button, then use the menu key to select.
5. After that choose reboot then finish.
