iphone 4 stuck at itunes logo with usb cable

iPhone 4 stuck at iTunes logo with USB Cable
location: macrumors.com - date: October 2, 2011
I recently followed a guide that allows me to upgrade to iOS5 Beta 7, while jailbreaking tethered, found here: http://cydiahelp.com/install-activat...ide-jailbreak/ After that all worked out, I went ahead and installed BackBoard form Cydia. Little did I know, if I tried to use a theme in it, it'd **** up my complete iOS because it wasn't compatible yet. When I hit install theme, the image went all black, and a little tiny yellowish image popped up in the middle. Then the iPhone crashed. I started it up, and booted tethered, and this screen just keeps showing up as the iTunes logo with the USB Cable underneath. As here: https://blog
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