A: The line is connected to the wrong Bluetooth light switch after replacing the battery does not work, this may be caused by the poor contact of the line inside.
1, disconnect the Bluetooth connection, open the shell, re-check it, and re-connect it after it is correct.
2, the method of wiring error is the most likely, should be the firewire end and the light line is not connected to the center of the dual control switch, the two positions can not be wrong, otherwise this situation will occur.