Jailbreak iPhone 3gs 3.1.2, then to 4.?

[pjhandlin]

**edit** I dont really need to unlock, I want to jailbreak

I am running a 3gs never JB on itunes 9.1.1 (12)

want to JB and move to 4. something?

forecast: baseband 5.11.7 bootloader 6.4 model mb717

After scanning through posts, it looks like I start with blacksnow.. but then what is next best step to take?

Thanks

 

[Applejuiced]

You should create a custom 4.1 ipsw with pwnage tool and restore to that.
Then open up cydia and install ultrasnow to unlock it.
http://www.iclarified.com/entry/index.php?enid=12349
No blacksnow.