Hi, I had a jailbroken Iphone 4 IOS 4.0.1 (8A306). For some reason I decided to upgrade it to 4.3.3 using Sn0wbreeze. During the final stages of restoring in Itunes, the Iphone got stuck with a black screen (DFU). When I made subsequent attempts, I kept on getting Itune error 3194. So I tried fixing it using TU and then it gives me error 1600. I have spent the last 3 days trying everything and even used Redsn0w (which seems to be working but then keeps dropping at the rebooting stage). I have also used Ifaith (to get me out of DFU), FixRecovery, IREB to fix the problems but no luck at all. Additionally, I have tried downloading my SHSH using TU from Cydia using me ECID. And currently TU shows that I have SHSH for a few IOS including 4.2.1 and 4.0.1. I am really feeling desperate as I feel I have tried everything and read almost a hundred posts in the last 3 days. So any suggestions would be very much appreciated.