Instruction I:
1. Begin with some manual work. Carefully remove the device's back cover and battery.
2. Do nothing for five seconds and then put everything back in place. Press the Power button.
1. Hold down the Power button in order for the menu to show on screen.
2. Choose the Power off option.
3. After a couple of seconds, hold down the Power button again. Your phone will turn back on. Voila.