I bet you didn't disconnect the battery and fan as Cosworth says. I'll run first race with mine on Saturday, no problems with updating/programming though.
Btw. it won't switch until radio is turned on, I think this is a feature, not a bug. In general, integrated switch is a great idea but I would prefer it to remember the last state. Previously I used to turn of my cars just unpluging cables from battery, now I have to turn it on every time. I also noticed that there's no spark everytime I plug in cables, maybe 4 times bigger cap sorted this out. And I'm really curious about temperatures as GTv2.0 was running quite hot, especially in summer. Hope you sort out your problem, once you start using it you'll love it.
