I recently got into my itunes and it said I had to upgrade my version of itunes so I clicked to upgrade it and now my iphone won't work. I had an unlocked and jailbroken iphone under the t-mobile network. It did work at first but my Cydia app and Installer app were completely erased and then I tried to restore it in itunes but it seems like I made it even worse by doing that. Now, when I plug my iphone in, there is the USB cord and itunes pic on my phone, that's it. About an hour ago when I was fooling around with it, I could only make emergency calls and the screen with the USB wasn't even showing up...I have tried to downgrade my firmware version but when I option-click on the Restore button in itunes and try to find the version of firmware, I can find what I downloaded but it won't let me restore it to that version. I don't know what to do at all...I don't have much experience with iphones as I just bought it about a month ago. I have googled it and read numerous pages but nothing seems to help me...Please help!!!!