Hello i have a 3gs 4.1 and i'm trying to upgrade to custom 5.0.1 (one made with Redsn0w and one made with Sn0wbreeze) but every time i enter pwned dfu mode and try shift + restore i get the 1601 or 1602 errors i tried using Redsn0w and iReb but no luck i really don't know what to do i've tried everything i found i need help please.