How to remove an evasion jailbreak?

I'm about to get sell my iPhone 4 and I need to remove my evasi0n jailbreak. I'm currently on iOS 6.1.2 and there's new iOS updated available. So how to I restore my iPhone so i can update to the latest software

Just goto itunes and normally restore and update your iphone. An evasion jailbreak goes with a simple restore. Just remember to backup your fone: p

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