Instruction I:
1. Firstly hold down the Power key and wait for the menu in which select option turn off the phone, or press and hold Power button and wait until the phone turns off.
2. Wait a couple of seconds.
3. Afterwards press the Power button, and wait until the phone turns on.
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.