How to unjailbreak iPhone 4 5.1.1?

I'm trying to unjailbreak because my phone is so slow now, and I have tried to restore and I also put in dfu mode and tried to restore but I get a error 3194 every time.

Added (1). I tried to update through the phone it doesn't work, I also did restore and update did not work

Format it

Magic…

It's because Apple isn't signing iOS 5.1.1 anymore. ( Which means Apple doesn't allow restores to iOS 5.1.1 anymore )
If your not planning to jailbreak your iPhone, the only way is to update to iOS 6 since you can't restore back to 5.1.1 unless you stitch your SHSH Blobs with an iOS 5.1.1.ipsw.
Long story short, update to iOS 6.
Hope I helped.

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