iPhone 5 can't restore even when using DFU mode
I'm not really sure if we are in the same boat. I had been stuck in DFU mode after restoring my iPad to iOS 6.1 without activating it. I have tried using iTunes in restoring the firmware but it was stuck on the iTunes and usb logo just like you. What I did was to use redsn0w to restore my iPad. You can use it without jailbreaking your phone. Hope this helps.