Jailbroken iPhone Update Confusion

So I jailbroke my iPhone months back and I've been meaning to un-jailbreak it for awhile now but somehow I just have never got around to it. Anyways, I forgot about the fact that it was jailbroken (silly me) and tried to update the software. Now, I am stuck with a phone that will only beg me to connect back to iTunes. Every time I do this, iTunes instructs me to restore and update it. I tried this once for the **** of it but nothing has changed. How do I get my phone working again? I don't care if it's completely wiped when I turn it back on, I just need it available.
Please help?

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When the iPhone is connected to your computer, iTunes recognizes it? What happens when you click on the Restore button? Does it go through any activity?

I'd try throwing it into DFU mode first then hitting restore inside of iTunes.I 've had better luck with that as its more of a last resort restore. If razors advice doesn't work give the DFU restore a go