SHP-DR708 - How to perform a factory reset
- Unlock and open the door
 - Take off the internal cover below the manual thumbturn
 - Press and hold the [REG] button for 5 seconds : Ding Dong -> Ding Dong
 - Enter the factory reset code 1470852369 + *
- Success : Ding Dong Deng
 - Fail : Dingdongdingdong