How to unjailbreak mi iPhone?

So I jailbroke my iPhone and now I want to download ios7. When I plug it into my computer and press restore it says that the this action can't be done or something like that. So can anyone please tell me how to get around this?

You have to run recovery mode: http://support.apple.com/.../kb/HT1808

You can't update if jailbroke with evasion

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