How to Downgrade Iphone 4 Baseband 04.12.02 to lower Baseband?

I accident update my iphone 5.1.1 to 6.0 then i downgraded to 5.1.1 again but the baseband didn't change. So my new base band is 04.12.02.is there a way to change my baseband to lower version so i can use my gevey sim? Cause now my iphone 4 is jailbreak 5.1.1 baseband 04.12.02 but i can't use it for calls since my gevey sim won't work on base band 04.12.02.

Lol nice copy you just change the 4.3.3 to 5.1.1.btw you can't change baseband.wait gevey update

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