Instruction I:
1. Hold down the Power button in order to power down the device.
2. Press down the Power button & Volume Up button to power up the phone.
3. Unless you pressed the Power button wrong, your phone should turn back on. The soft reset is complete.
1. Take off your phone's back cover and remove its battery.
2. After five seconds pass, put the battery and the cover back in its place and press Power button.