I have a 3GS with 4.1 and 4.3.5 SHSH saved and updated to iOS 5 is there any way to go back to any FW and get a untethered JB (windows xp)? When I try a stock 4.1 it goes through the complete restore process but errors after verifying iPhone screen (1015) and than I get the connect to itunes screen (USB -iTunes screen). Any ideas guys?