Is it worth re-installing. Just don't want to put him in trouble for it. He has booked the car in next week for the dealer to fix the problem. Any excuses he can use for the problem he has now (that I caused) with Dealer?

Even though it has gone to default mode - he still has everything (inc Aux Vent, DSP, Code, etc... except Navigation)

Stevep have you tried another disc or v27? Let me know please.