Hello from Germany,
well, I retrofitted a Discover Pro with bad end.
My 2013 Golf Mk7 was delivered with a Composition Media and so I
changed the HU and Display. At the first time it worked very well.
But with the "Component Protection" the Radio was muted.
Ok - so i drove to the dealer and he unlocked the Discover Pro.
But at this moment the Nav doesn´t work any more.
After 20 sec. of working, it says "Navdata not valid"...
look:
https://www.youtube.com/watch?v=YsL6l-M_PvwI think the navcards are bound to the car´s VIN , like the A1 MMI 3GP.
(As my car wasn´t delivered with Nav, there is no possiblity to bind it to my car´s VIN)
You can´t retrofit it.
I've spent a lot of money for it.... uuuaaahh
regards
Futzel