1. The controller has already opened the code without entering any serial number. The prompt for entering the serial number may be the password you set.If you have forgotten your password, please contact your local dealer. If you only change the meter password, it not be eliminated. 2. Before replacing the controller, check the battery voltage and check with a multimeter. If it is higher than 35V, it can be turned on. 3. Each signal line corresponding to the picture shown must be securely wired, and the replacement of the controller must not crush any signal lines.If the signal line is crushed, it not be repaired (crushing the signal line or the motor phase is not covered by the ) 4. The controller cannot be changed at , which may cause serious damage. 5. Do not use this controller if you modify the battery or motor privately. This controller or instrument can only be used interchangeably with for 's products. It is strictly forbidden to be used in cottage cars or vehicles. The appearance of some parts may be different due to different factory batches. Colour:Photo Color Material:PCB Package Contents: 5 x M365 Pro Electric Scooter Dashboard 5 x Cover 5 x Double Sided Tape Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.