Hi, needing help, I have changed from a cd500 to a navi950, I have a Astra j and the navi950 came from a Mokka so i have to use the buttons from the cd500, all is working fine including the dab+ module except for the controls they are wrong, 90% of the buttons do different actions. do i need to find a set of buttons from a Astra j or can the navi950 be reprogrammed to work with the cd500 buttons? Thanks