Does anyone have any suggestions on how to enter DFU mode. I tried RecBoot but it goes to the plug and itunes symbol on the iPhone. I sadly lost my iPhone 4 this weekend so my brother is letting me use his old school iPhone 3G which the lock/power button is broken. I updated to 4.2.1 and created a custom IPSW with Sn0wbreeze, But I dont know why it's not proceeding. When I use RecBoot and enters Recovery Mode, I select the custom IPSW build from the select in itunes. iTunes then says "preparing iphone for restore" and just stays like that. Help anyone?!