H guys. I got a bit problem. I just bought ipod touch three days ago. And i was just trying to update the software. It was i guess 2.0.2 firmware and that time there was 2.1 was available. So i though give it a try. But somehow itunes wasn't able to download the firmware completely but it showed that it is downloaded and asking for installation. After that my installation was broke down and now my ipod is stuck showing itunes and USB icon. I googled for three days tried every thing possible. When i try to restore it from the internet it gives 1604 error. When i try by giving it the firmware by Shift Click it says error 5. And when i try in DMU Mode it gives error 1. So you c guys its a BIGGGGGGGGGG problem. I don't know what to do. 
Please help me out here. Thanks