IPhone Jailbreak Restore Problems?

I have a jailbroken iPhone 4S, running 5.1.1 software, but I wish to un-jailbreak the iPhone. Fistly, iTunes isn't recognizing my phone at all, and isn't showing up under devices. Second, when I put my phone into DFU mode and try to restore, iTunes says that it couldn't restore, because it couldn't recognize my device. I really want my iPhone to be restored to factory settings, but I don't know how.

You must of done something wrong… You can try updating to iOS 6 and then restore from an ispw with iTunes by clicking and holding shift the check for update button and selecting a downloaded iOS 5.1.1.ispw you can download on the internet.

You should also update your iTunes to the latest version iTunes 10.7 and making sure your device is connected properly or you have to do a custom firmware with redsn0w, then use iTunes to restore it.

Just make sure you're device says Connect to iTunes instead of DFU Mode.

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