How should I jail break my iPhone 4 the proper safest way?

If so I heard if you phine it stops working completely blacks out you need to back it up and it will return to factory settings and it will work again can anyone help me on how to jailbreak my phone the proper way

You have to google search Redsn0w. That's the only one (apart from one other) Jailbreak host you can trust when your on a 5.1.1 version. Trust me. I tried limera1n and stuffed up my sisters iPod. :/ got google search redsn0w and they will tell you what to do.

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