How to unjailbreak an iPhone 4?

I have an iPhone 4 running ios 6.1. I jailbroke it using evasi0n 1.3 but now my phone is slow so how do I restore it to factory settings?

Put it in Recovery Mode by turning it off and then restarting by holding the Power Button and the Home Button until you see the logo on the screen then plug it into iTunes and restore it.

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