Hi all, I was just trying to Jailbreak my iPhone 4, because I accidentally updated to 4.3.5. when I follow the steps like changing the Hosts file and using tiny umbrella, nothing helps! I try to downgrade to 4.3.4 and when I try to do so, iTunes prompts me that there was an unknown error (1604) or (1600). I REALLY NEED TO FIX IT! I have tried pwnage tool and everything! I am running Lion, and I hate it tbh!