Moin… I have a c30 ez.12/2007 and according to FIN mj08 and in this is a “high performance sound” system installed. I have an aux input in the middle armrest and use this in the moment to listen to mp3 via mobile. Now it is quite cumbersome and I want to listen and control mp3 via usb/cd on the radio direct. As far as I am informed, my radio mp3 would have to be able to play via CD. But does it not start from me unknown. Now to my question: Why does my radio not play mp3-cd? W he I can upgrade usb and what did it cost? (No ipod and no Bluetooth needed)