Can you explain more about cd changer ? Was it the same from your car ? A replacment ? . There is componet protrction on cd changer that basicly triggers saftery mode hence all issues. Only audi can remove CP
I presume as you have facelifted a6 c6 you have mmi3g. There are 2 versions .
Mmi3g basic - sat nav dvd unit fitted in the glovebox or in the boot( left compartment )
Mmi3g high - hard drive version
With one you have ?
I belive you can buy from ebay . But audi activation is the key for it to work. You might want to call audi first and ask them how much is activation only as you wanna buy maps elswere
Its not that simple. A6 c6 sound system works on MOST fibre optics .
So the only way is to retrofit oem ami or an aftermarket device like dension or vns media