So when will it be released? Sunday most likely (17/06/2012 or 18/06/2012). MuscleNerd lives in Los Angeles and the time there is now:
This will also enable you to get your phone officially unlocked through your carrier, possibly for free, which will mean you will not need to install Ultrasn0w.
Any 3G / 3GS (old [note you can use fuzzyband for old bootroom] and new bootroms) above 05.13.04 can be temporarily and safely updated to 06.15 BB for the purpose of downgrading to the official 05.13.04.
Step 2: Download your correct IPSW for your device and version (latest: 5.1.1)
Step 3: Ensure you have the latest version of iTunes for your system, if not:
Download iTunes 10.6.3 (64 bit Win)
Download iTunes 10.6.3 (32 bit Win)
Download iTunes 10.6.3 (32 / 64 bit Mac)
Step 4: Open up Redsn0w and click Extras > Custom IPSW
Step 5: Navigate to where you downloaded the IPSW
Step 6: Plug your iPhone into your computer via USB
Step 7: Open iTunes
Step 8: Right click on your device in the left hand pane and click backup
Step 9: Jailbreak (follow the helpful instructions in Redsn0w)
Step 10: Open iTunes, go to summary > version
Step 11: Click the Restore button through: Alt + Click, and navigate to the custom IPSW you created.
Step 12: Downgrade the baseband in Redsn0w
Step 13: Restore from Backup in iTunes
Step 14: Setup your Jailbroken iPhone once again :)
Absinthe (Mac + Win + Linux)