IPhone jailbreak gone wrong?

So I jailbroke my iPhone 4 iOS 6 with redsn0w like a week ago and everything was fine until I downloaded the Zeppelin tweak (lets you change carrier icon) and my iPhone was stuck on the apple screen. I left it alone until the battery died and then rebooted it. I have a tethered jailbreak so the iPhone was running normally except Safari won't open now (it will open but the page won't work and the URL bar/ google search bar won't respond)

I tried to boot tethered, and it seemed to work and took me to my lock screen but quickly went back to the apple logo.iFunbox quits unexpectedly everytime I try to launch it so I can't remotely uninstall the tweak. Cyber duck can't establish a connection with my iPhone either.

What do I do?

Thats because those jailbreak sites are scams and fake and they are just random people creating files that arent real and fake. Thats why no one should jailbreak it ever because you can never tell from those sites if one of them has the wrong program.

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