I just used Ultrasnow 1.2.3 on my 3GS running 4.3.3. It resulted in the iPhone to be stuck in searching. No signal, or anything. Why is that the case? I'm currently doing a restore, which will also inconveniently undo my jailbreak but I'm fine with that for now. Is there a way to downgrade from 4.3.5 to 4.3.3? and then re-jailbreak it? then attempt another unlock?