Hi, I have just inherited an iPhone 3G and I am trying to install the pwned DFU from redsn0w. I have successfully entered DFU mode following the instructions, but then I get a "USB communication error" but the iPhone is recognised as being connected on the first page of redsn0w. I have tried restarting my computer, changing USB port, restarting the iPhone and reentering DFU mode. I have done this on two separate computers, the first running OS X 10.8.2 and the second with Windows 7, both with the latest iTunes installed but not running. Any ideas? Thanks!