I am running iPhone 3G with 3.1.2. Trying to upgrade to 4.1 using Pwnage tool 4.1.2. I successfully created the custom ipsw but at the end of the DFU process my phone went black and I got a "failed to enter DFU mode" from Pwnage tool, which then proceeds to tell me I "successfully entered DFU mode" (??) I cannot turn the phone back on, using home or power button. If I connect to iTunes, I get a message saying "itunes must check the iphone software update server to identify this device". I can choose "cancel" or "check", but I just choose cancel--too scared to check anything. Running iTunes 10.1, BTW. Hope my phone isn't bricked--any way out of this? I followed the steps correctly... Thanks.