Jailbroke to 3.1.2 on a 3G using PwnageTool. I decided I wanted to redo the jailbreak, but when I did I got the 1600 error in iTunes on my MBP. I've read the error can be bypassed by either (1) not going into DFU mode and just option-restoring with the custom .ipsw or (2) reinstalling iTunes. I'm doubting the iTunes fix, but I'm not sure about the other. Any thoughts on how this is supposed to work for a re-jailbreak? Edit: I forgot about this one other fix: delete restore files found in ~/Library/iTunes/Device Support.