I have just done a nand backup, then unrooted (downgrade), then used Unrevoked to root and did a nand restore. Btw that took forever! Anyway after it was said and done the phone rebooted, and viola everything was back on there. The only hitch is since I have done the restore my phone has shut off by itself 3 times. I was ever so reluctant about doing the whole Unrevoked process and this is why. Has anyone else experienced similar issues? Please help! Update: It hasn't turned off since after the third time so I guess it's stable now.