I tried to upgrade my N900 with the installation of http://wiki.maemo.org/Community_SSU/Thumb, but something went wrong.

The phone does not boot any more, I can switch it on but then the screen remains dark (with a light backlight glow to see that it is not the battery). I can switch it off, this does work as well.

Is there a way to get into the system without reflashing? In order to have the address book data and some fotos recovered? Most of the private data is on an external SD-card, which I could recover. I missed out to backup the address book data and some images... as I was overly optimistic that nothing will go wrong with the upgrade ;-) :-(