hello. If you are talking about model 60-75 series, behind display got a display board with 3 leds, two leds must be solid ( on) and one must be blinking (if that led diode is solid or off) you just need to reset display board.just connect the negative of the battery cell to one connection that says "CC", after that you need to change language and set speeds for sideshift funtion. for that you need to move the rotary switch and with the buttons you could get the new values.