How to take my jailbreak off for my iPhone 4?

I jailbroke it with green poison and now I'm trying to take it off so I can do the iOS updates… But when I back it up that works… But every time I try to restore it it won't work. A error message comes up. Please help me. What am I doing wrong? Tell me how to take it off please

What I do is download snowbreeze and redsnow, use snow to download the right firmware, and use redsow to install it

Can't update jailbroke iphones to ios 6.
you shouldnt of jailbroke it.

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