It is a bundle of iPhoneOS 3.0 for iPhone 3GS.
+Added patch to apply 24kpwn to LLB.
How to use
Put it in "FirmwareBundles" of Odysseus and create CFW.
Next, put the device in Pwned DFU Mode (limra1n exploit) and restore it with the options -w and -e in idevicerestore.
*SHSH is unnecessary, but you need to prepare an empty plist file.
**If you downgrade from iPhoneOS 3.1 or later you need to restore twice.
(new bootrom only) Finally, apply alloc8 exploit using ipwndfu.
Note: This version of Bunlde does not include the 24kpwn patch.