For firmware update instructions, please refer to
Below are factory reset instructions.
1. Unplug the MicroSD card.
2. Press and hold the POI & Function button, then press the power button(Press the three buttons at the same time). Hold pressing for about 5 seconds. Release pressing until the status lamp lights green.
3. You can hear a long beep after about 13 seconds.(Please notice that it should not take over 20 seconds to wait for the beep.)