IPhone iTunes error 1015?

I have an iPhone 3Gs and it was firmware 4.2.1 and i tried to fallow a video i saw on youtube on how to jailbrake and unlock it and i did all right but when i went to cydia to install ultrasnow it froze and kept making a sound, i turned it on and off and now its stuck in recovery mode and when i plug it i keep... show more I have an iPhone 3Gs and it was firmware 4.2.1 and i tried to fallow a video i saw on youtube on how to jailbrake and unlock it and i did all right but when i went to cydia to install ultrasnow it froze and kept making a sound, i turned it on and off and now its stuck in recovery mode and when i plug it i keep getting the 1015 error i just bought the iphone too! Someone please HELP!
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