As others have mentioned, the upgrade process is designed to be interrupted if needed.
I simply started mine before heading off on my work commute. Stuck the USB drive in, the Navigation system detected the update, I entered the FSC code and the update process started. My commute is only 20 mins, so needless to say it didn't finish.
Then on my drive home, the progress restarted.. initially at zero, then the progress indicator zoomed to 60% done within seconds (from the previous morning update), then finished before I got home.
Originally Posted by 2kaccordocoupe
how did you folks do the update, were your driving in your car doing your normal commute, errands etc... while it updated, did it sit in acc mode running on the cars battery, did you have a battery charger hooked up to it while it ran - just curious