Instruction I:
1. At the beginning remove the back cover and the battery for a couple of seconds.
2. Put the battery and the cover back in.
3. Turn on the phone by holding the Power button.
1. Turn on the device's display with a Power button.
2. Now press'n'hold the Power and Volume Down buttons for ten seconds.
3. Your phone should now reboot and restart, indicating that the soft reset process is a success.