After receiving it, the door cannot be opened. Please use a USB cable to connect to the power bank for activation first. Please refer to the tutorial link: https://youtu.be/uCjrn8iMrQI
2. Unable to open the door after using it for a period of time, your fingerprint lock may be out of battery, it takes around 1.5-2 hours to be fully charged for the fingerprint lock, and the LED won't flash when it is fully charged.