How to remove jailbreak from iPhone 4 without restoration?

I want to know if it's possible. If it isn't, please let me know how to go about then.

**ALSO, will restoring my phone force me to upgrade to OS 6, or will it remain at os 5.1.1 (which is what I want!)

Thanks in advance

Added (1). How can I download 5.1.1?

Can't apple no longer signs for 5.1.1.
and update or restore goes to ios 6

It's not possible.

If you have the software for 5.1.1 (you can download it) then you can still stay with 5.1.1.

Edit: Just because there's an update doesn't mean that you can't get it anymore. I've put a link for download in the Source.

You need restore it.

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