I'm pretty new with the N810, just had it 3 days. Bought it while on the road and was very pleased with everything it had to offer. When I got home yesterday I flashed the upgrade to Diablo. Unit rebooted during the process and worked great...till I turned it off (battery full at this point). It wouldn't turn back on. Tried everyting I could think of....battery out for 20 minutes or so, with charger (no charging bootup), even call Nokia (they said problem with unit - take it back for exchange) So now I have a new N810 and kinda leary of flashing this one. Anyone else have a problem, was it something I could have done?