How to un-jailbreak my iphone 3GS when itunes error code 3194 keeps popping up?

Everyone tells me that to unjailbreak my phone just restore it. I keep trying and it always comes up with error code 3194, saying apple won't restore it cause its been tampered with. I've also tried doing it thru redsn0w but that doesn't work either.i've treid updating to IOS 6 on my phone and an error came up too. Any info will help

Use ireb then restore.
or edit your host files.

Back your phone up to your itunes account then do a full wipe and set it back to factory settings update it then sync it with your computer i have done this 3 different times with my phone 3gs

Restore with itunes.

Use IREB to go to DFU mode then update using itune with original IPSW file it will unjailbreak your phone. Its looks your phone having problem going to DFU mode if any more problem let me know i will help you on this.

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