what do i do to unlock 3.1.2?

Most 2G iPhones have already been permanently unlocked.

What OS were you running before? Was the iPhone jailbroken before you upgraded to 3.1.2?

Your choices are blackra1n or pwnagetool (make and restore a custom ipsw)

I recommend pwnagetool, less buggy. Blackra1n is faster but you will experience problems with hackactivation that can generally be fixed. It's just more of a hassle to fix these.

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Please read the stickies and search the forum before posting!
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iPhone 3GS 32GB factory unlocked (3.1; Pwnagetool, Cydia, OpenSSH)
iPhone 8BG (3.1.2; Pwnagetool, Cydia, OpenSSH)

I want to update to the latest 3.1.2 but I dont have access to Mac.

I have a 2G on version 3.0 - unlocked using pwnage & directions from iclarified.

Any suggestion?

rishi_malik@rediffmail.com

Due to the rules of this forum, we can't provide links to files containing Apple's copyrighted material. You need to google for a pre-made 3.1.2 ipsw for your iPhone model, make sure the ipsw was made with the activation option checked in pwnage tool.

Because you are already jailbroken you can simply shift-click restore in iTunes and select this custom ipsw to go to 3.1.2

__________________
Please read the stickies and search the forum before posting!
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iPhone 3GS 32GB factory unlocked (3.1; Pwnagetool, Cydia, OpenSSH)
iPhone 8BG (3.1.2; Pwnagetool, Cydia, OpenSSH)