geohot has released his tool blackra1n to jailbreak 3.1.2 for ALL devices. This is a windows
only release for now. iPod Touch 3rd generations must have their device plugged in and have to run blackra1n on every boot (tethered).
DO NOT USE THIS TOOL IF YOU NEED AN UNLOCK. THIS REQUIRES YOU TO RESTORE TO 3.1.2 PRIOR TO USING, WHICH WILL UPGRADE YOUR BASEBAND!
Instructions:
1. Update or Restore to 3.1.2 in iTunes (BASEBAND WILL BE UPGRADED FOR 3G AND 3GS)
2. Launch blackra1n
3. Press “make it ra1n”
4. Enjoy!
Download blackra1n here:
CLICK HERE TO DOWNLOAD!
Via blkcadi:
Take heed people.
Warning 3g and 3gs unlockers, do not upgrade
to 3.1.2 using iTunes if you want to keep your unlock. Baseband cannot be downgraded. Check out the dev team’s offerings. Also blackra1n doesn’t hacktivate.
TO FIX ISSUES WITH IPHONE BROWSER, DISK AID, AND OTHER USB BROWSING SOFTWARE:
blackra1n doesn’t patch the services.plist. You will have to do it manually to get usb browsing back.
SSH into your phone and navigate to /System/Library/Lockdown/Services.plist
Copy Services.plist (copy the original for backup) to your computer and replace it with the following file:
Reboot your phone! DONE.

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yech
Posted on October 13th, 2009 at 10:01 pmi’m new to jailbreaking, and my phone is running on 3.1 firmware unjailbroekn,why don’t i need to upgrade the baseband? what can that cause?
Jason
Posted on October 14th, 2009 at 1:19 pmThats whats up. I thought I would never have Cydia again. All my cracked apps it’s been so long, i’ll never let apple take you away again!!! Thats what I call fucking with the Crackers. pun intended
E Reyes
Posted on October 14th, 2009 at 4:00 pmif you upgrade the baseband you loose any possibility of unlocking your phone in the feature.