Originally Posted by RichardP1

If you don't update the radio you will be able to play MP3's from the changer but you wont be able to get the MP3 information displayed.

The Radio is the only device, appart from the Sirrius Radio, that can send iBus messages that display text on the screen. To display ID3 info the CD Changer sends a message to the radio and the radio then sends the message to display the text. If you don't have the new radio then the display messages never get sent, although the CD Changer does send the ID3 information messages.