this USB programming cable allows connection of a PC and the 8fun Bafang BBS02 mid drive motor electric bike kit in order to change the basic user level controller parameters, this does not allow for changing of the firmware and is safe for you to perform. You will NOT "fry" your motor by making changes to these parameters. The changes have been made based on customer requests to improve the following complaints: make the throttle act as a throttle should instead of like an on/off switch, reduce current draw from 25 amps to 18 amps without impacting performance to increase battery and motor life, enable full throttle in PAS levels 1-9, throttle over ride of max set speed limit (max speed only applies to PAS). Compatible with BBS01, BBS02 and BBSHD motors.