How to jailbreak when you don't have blogs?

I have iPhone 3GS and its currently running on ios 5.1 which is jailbreaked. Now I want to upgrade my iphone to ios 6 but the only way to update my iphone is to update it to ios 6.1.3 because apple is not signing the software if try to update it to ios 6.1.2. I tried using tiny umbrella server to get it to sign the software but still iTunes shows error 3194 or any other error. Is there any way to update it to ios 6.1.2

You should try a Jailbreak service. Here is a good one.
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