How to update to IOS 6.1.2 and NOT 6.1.3, Yet downgrade to IOS 5.1.1 if needed?

The thing is that my iPhone is locked to ORANGE UK and the IMEI unlock just won't happen anytime soon so i'm using a Gevey ultra S right now on IOS 5.1.1, I wanna update to IOS 6.1.2 so as to preserve my jailbreak and see if the Gevey functions on IOS 6, But if it doesn't i shall restore it to 5.1.1 again… Any way around this?

There's no way to update in iTunes to a lower iOS that the one that is currently being signed by Apple. Unfortunately that is 6.1.3 for most devices.

You can check your device here; ; www.isthereajailbreak.com

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