Originally Posted by ix35
you can perform a factory reset, but if you re-read the discussion are indications of how to upgrade the whole system, which I would recommend
Vladimir2k9 first made a backup of his device with an app (wich i don't remember, if one can point us to one that worked for him...).
Also, you can use some flash file, it's as easy as putting an update.zip on an sd card and reboot!
Use the mega folder of vladimir to find an update.
I never used it, but there is a backup and restore function in settings (at least you can reboot the device with it).
Also, some combination of pushing the rotating volume button (or play/pause) then another key (i my device it's "eject" at the opposite of the dash) when powered off make you boot into recovery mode.