: Refers to the specific Audi vehicle platform, commonly associated with models like the Audi A6 , A7 , and Q7 (4M).
: Enabling Apple CarPlay and Android Auto on units where it was not factory-activated.
: This is the specific firmware version (or "train"). Version 3663 is widely recognized in the Audi community as one of the most stable and final official firmware updates for these units. The "Exclusive" FEC Patching