Hey, I'm wondering if it's possible to restore to 4.0 in Windows? I know you can downgrade... But I'm having trouble upgrading. I get error code 13 or 15... Just depends. Should I try Alt+Shift & click restore? TIP: Anyone who has a failed restore or update... Just run redsn0w 0.94 and point to 3.1.2, click already pwned and it'll boot your iDevice the way it was before you tried to restore/update.