Bafang Ultra G510 motor controller for replacement;
M620 Ultra motor controller for high power e-bikes.
Bafang Ultra controller 48V 30A or 52V 30A for replacement.
This controller is only suitable for UART protocol Ultra motor. If your motor is CAN protocol, this controller might not fit.
How to clasify UART or CAN protocol for your M620 motor? Please check the connector of the display, UART protocol motor is with round connector while CAN protocol motor is with triangle display connector.