my friend recently gave me her iPhone 3G 8GB. Unfortunately, when i plugged it in and updated it, it wont boot. i get stuck on the "connect to itunes screen" when i hold the power button, it turns off, but no slider appears, nor is there an emergency call slider at the bottom of my screen. everytime i try to enter DFU mode, it gets caught on this screen. iTunes wont recognize it, tinyumbrella wont recognize it. HELP please.