Un-jailbreaking a iPhone 3gs?

I jail broke my iPhone 3gs, and it is a tethered jailbreak, I'm trying to sort of… Upgrade it to a un tethered jailbreak, but when I try, I get: Error: Device is already jailbroken.

So how do I go about sort of taking the jailbreak off, and re jailbreaking it.

Go to Cydia and download Rocky Racoon, this will make it untether. You need to be in a firmware that support untether, if not, you need to upgrade a the latest firmware and re-jailbreak.

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