i have jailbroken plenty of iPhone 2G's and IPT's for my friends using Pwnage tool on my mac and never had a problem till i tried to jailbreak my own iPhone 3G 2.1 firmware. I built the custom restore file and put my phone in dfu mode. When i got to restore wiht the custom firmware it and it goes through extracting software fine then on Preparing iPhone for restore.. it says The iPhone "iPhone" could not be restored. An unknown error has occurred. I already restore back to original 2.1 and tried it again and i got the same thing. What could be causing the problem?