I just wanted to thank all involved in this, it is just what I have been looking for.
I am running an F930BT (european model) unit and despite a few mistakes on my part it was pretty smooth.
My main reason for running it is to enable me to backup (more specifically MOVE) my SD cards from my camera directly to a large USB drive, via my headunit. I just leave hackmode on all my cameras micro SD cards and when I run out of space I stick them in the avic and move everything to my mass storage to free up the card. Great for touring holidays.
