I've just bought a iPhone 3GS of eBay for my girlfriend & I try'd to jailbrake it. But now it's stuck in DFU mode (iPhone saying connect to iTunes). But when I connect to iTunes & restore it, when it finishes it says it couldn't complete the restore & a error code comes up
Ive had this problem too and its not in dfu mode its in Recovery mode, put ur phone in dfu mode agian while disconnected from computer and then hold down power button for 5sec then just wait and give it like 5min, it should boot up soon after that tell me if it helped.