I may have screwed up and need advice. I have a iPhone 3GS with bootrom 359.3.2. I wasn't able to jailbreak with Pwnage Tool 3.1.3 and ended up not able to load the phone at all, so I did a standard Restore in iTunes which brought the phone to iOS 4. Now I can't jailbreak it in iOS 4 OR downgrade to 3.1.3. Whenever I try restoring with an official 3.1.3 IPSW, I get the Apple verification error, so iTunes won't restore the firmware. I tried the trick of editing the hosts file, but same thing happens. When I try Restore with a Custom iOS 4 ipsw, I get a 1604 error. Any ideas? How can I either go back to 3.1.3 or JB the phone in iOS 4? Thanks!