I can't jailbreak my iPhone no matter what I try! I've tried using pwnage, quickpwn, but each time i enter DFU mode, i get error 2001, 1600, or 21. I've tried every possible tip i can find online, and nothing. I've tried restoring the device to its standard Firmware, and I still get one of the 3 errors when i try to Upload my custom firmware using iTunes. I've reinstalled iTunes 3 times already! ARRRGGGHH!!! I've been at it since 4, and its 8 now! Why won't it work?! I've tried it on my black macbook running 10.5.6 AND on my dad's PC running Vista, and i get the same error no matter what platform i use.