how do i update my iphone 3g when i have 2.2 with yellowsn0w

[ovechkin0989]

jail-broken/unlocked and i wanna get 3.1.2 ? i wanna get 3.1.2 unlocked and jailbroken for the iphone 3g 8gb. the carrier i have is t mobile. does anyone have any sites or a step by step/ youtube video showing how i can get it from verision 2.2 to 3.1.2 with having yellowsn0w?

 

[m6tarry]

http://techpp.com/2009/11/03/jailbreak-iphone-312-firmware-with-blackra1n-rc3/

 

[Peng]

The only one available rite now is BlackRain
It is like Yellow SNow except when u turn Iphone OFF u have to use the program to turn it back on. Not sleep mode.
But here is the step by step