I have this iPhone 3GS from Softbank and it's stuck at phone activation. This is 06.15.00 iPad baseband with iOS 4.3.3 so I decided to update the iOS to 5.1.1. I did all the things needed but for no luck, I was stuck there. I followed to tutorials. First is using sn0wbreeze, link here: http://www.beijingiphonerepair.com/...-ipad-baseband-6-15-00-with-sn0wbreeze-2-9-5/ and second is using redsn0w, link here: http://www.beijingiphonerepair.com/...4-or-3gs-with-redsn0w-custom-firmware-winmac/ By the time I restore it, I get a 1600 error.