Hi M8 the telematics CD updates your Audio or Comand, as no matter the production year of the production year they have software as of the first day they were revised, for example 2006 production date has soft version 2004.

it also updates additional functions as voice comm on the 2008 and newer, but i cant confirm since i didnt try it on audio 20 ( with 6 CD ), 50 and comand units , once i do will net you know.

Xentry with developer does it easy, on das with dev its harder as the menu is different and the point asking for CD wants SCN too, so i am still searching to go around it through the dev mode.

But 204,212,207 works just fine.