My problem had nothing to do with interruptions, I had Coffee
The update would not install - I got an error like this; https://dl.dropbox.com/u/39580456/2012-09-24%2018.36.39.jpg
Then the unit died when I tried to exit and power off.
However, after going through Armin`s list of resets, I was finally able to get the unit to work again.
I believe the problem is related to number of profiles prior to upgrade, I never counted how many I had installed. (Others have experienced same problem)
I deleted all of them by flash delete, and only re-installed profiles I needed.
Now the unit boots nicely with less than 500 profiles