Hello, I bought an A2. Pick up the car next week. I would like to exchange the Radio Chorus (picture) for the Radio Concert 2. Found a concert where the blind fits. (so not from the A4 o.ä.) Since I am technically not so fit, I need your help: Can I just switch the radio like that? Must something be programmed in the workshop or cable installed? Do I have to disconnect the battery for the exchange? Did not find any concrete statements in the search. Would be nice, w someone can give me an info!