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So I just download the IPSW from here:
quickpwn.com/2009/10/jailbreak-iphone-3-1-2.html
then what, jailbreak with blackra1n and unlock with blacksn0w?
I'd prefer to use the dev team's JB/UL. Is that not possible on a Windows PC?
It's pretty simple: I am jailbroken using redsn0w on 3.0 and unlocked with ultrasn0w using a 32GB 3GS, and I only have a Windows PC. I want to upgrade to 3.1.2 and keep my jailbreak and unlock and not update my baseband.
What are my options to do this?