I am an iPhone rookie, so I have come to seek your advice. This is my best recollection of what happened. I have an Iphone 4S that was jailbroken. I tried to restore it using iTunes, but was unable to. From that point, the 4S would not turn on. It would just flash the Apple logo, and I believe it would only flash the logo if it was plugged in. Subsequently, I have put the phone into Recovery and DFU mode, and tried to use Redsnow and TinyUmbrella. Nothing has worked. I get various errors when trying to restore with iTunes. Depending on what I've done with Redsnow or TinyUmbrella, I have gotten error 21, 1600, 3194. I looked up the solutions to these errors but even so I have not been able to get my phone to be functional again. Also, when I use Redsnow and try to put the 4S into DFU mode, there is a message that says that "Sorry, that isn't supported yet on the iPhone 4S." What can I do to make my phone work again? I am a complete novice about this stuff. I don't really know how to use Redsnow or TinyUmbrella, so if you can give me step by step instructions, that would be wonderful. Thanks in advance!