Jailbroken Iphone won't stop rebooting?

Just jailbroke my iphone, i don't want to hear anything saying i shouldnt have done it.
I used the same website my friend had used and hers was fine.
I went to go and try to change the backgrounds and my phone will not stop rebooting.
all it is is the screen with the apple on it and its all black, and it will not stop.
anyway to stop this or do I have to go buy another phone?

Restore it

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