HELP!!! Sorry to create a new topic, but I need help ASAP. I've read through threads and researched several of the terms you all used that I didn't understand, such as DFU mode, but I can't get my iPhone 4 to downgrade back down to iOS 4. I just want my phone back, I don't care about any data, just downgraded back to original factor settings as soon as possible. My iTunes 10.2 would not recognize my phone in iOS 5, so I upgraded to iTunes 10.5. When I plug in my phone, it says my phone is not registered and can not be restored. PLEASE help me restore my phone, it would be greatly appreciated!