How to remove jailbreak for iPhone 4 (5.0.1) redsn0w?

Okay so I jailbroke my iPhone 4 with the redsn0w software or whatever and now i don't know how to uninstall it. Firstly I have tried the "restore" method but I always have to download the newest iOS, but I can't because of the jailbreak. I'm stuck on 5.0.1 and I'm unable to restore it or download the new iOS because of it. I have Sprint, and I tried everything I can to try and remove it, but nothing seems to work for me. Help please?

P.S I have tried looking on the internet, but no one seems to have asked or posted about fixing it.

Connect your phone to your computer, press and hold the power button and home button together for about 10 seconds and then release the power button and keep holding the home button and a message on iTunes will say that your phone is in recovery mode and will tell you're restore.

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