My iPhone 4 won't boot past the apple logo?

I jailbroke my iphone months ago and there hasn't been any problems until what I think I did to screw everything up. I went into diskaid and tried to delete part of a theme. When I tried to load it on winterboard, some icons just started disappearing when it resprung. Then some more, and then finally it turned off and it won't go past the apple logo now. Is there any way to fix this without restoring and upgrading?

When something like that happens it's pretty much a guarantee you need to restore it.

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