[bteamer]

DFU (Device Firmware Upgrade) mode is not the same as restore mode. DFU mode bypasses the current OS installed and allows you to upgrade or downgrade your OS. If you are getting errors trying to restore in iTunes, DFU mode is very likely for you.

This is how to achieve DFU mode. You can do it on every phone:

Method 1)

* Attach the phone to the pc
* Turn the phone off
* Hold power and home together for *exactly* 10 seconds
* Release power but keep holding home until the pc beeps as a USB device is recognized.
* At no point will the display come on. Now your restore should work.

(Source: sleepers.net)

Then in iTunes it should pop up llike you have a phone in Recovery Mode. On windows, a little bubble pops up in the bottom right hand corner saying like Found New Hardware Apple iPhone DFU mode or something like that. Then just restore in iTunes.