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Originally Posted by quadraspleen
update
I just ran the CD to see what it all does. Being a computer engineer, I'm not scared of these things 
It scanned the system and told me what I had and whether or not an upgrade for it was included on the disc. It then said "Start Download" and that's where I stopped! Is this going to mash my system? Surely not. It all seems very straightforward. There is logging so I can see if it was a success or not...I read somewhere on this board that I need a "constant voltage" to the battery while upgrading. What does that mean? Can I do it while the car is ticking over?
Any help appreciated 
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You need to supply the battery with a 12 volt charge as the update takes 40 mins and you cant do it with the engine running,also no other consumers must be operated as any voltage drop may cause ireversible damage to the mmi units.This is best done by the dealer as a software up date needs to be registered with the server in germany for future referance to repairs and recalls.