I've just attempted to do a software update on my 2004 A8 W12 which appears to have gone badly wrong - The original software was 0890 - very old, so I bought (original) upgrade discs from an audi dealer. The first disc upgrade appeared to work OK but the second disc did not. Now the whole car has shut down - won't start up at all. Locks OK but that's about it - though the mmi still works, albeit without certain components such as amp or nav. Any ideas anyone?

 

Panic over - just needed a jump from my trusty Landrover. The update does suck power out of the battery!