Been having problems jailbreaking my iphone 3G. I did jailbreak it before but then made the stupid mistake of doing erase all content and settings. So i had to do a restore on it using original firmware since my custom got deleted. I made a new one with sn0wbreeze, tried both normal and expert mode making it. I go and put it in DFU mode and try to use it on restore with itunes, but then my computer says "this device can run faster" and afterwards itunes says error 1600. I've tried also using iREB like everyone else says and still nothing. It's iPhone 3G with firmware 4.2.1 with modem firmware 05.15.04, latest version of itunes and using Windows 7 x64