Last weekend, the Dev Team released a major update to its RedSn0w jailbreak utility. The update is small but worth-noting.
RedSn0w 0.9.12b2 is available on the Dev Team’s website. It features a new rocky-racoon injection option and an iBooks bug fix.
“Update #1: Starting with version 0.9.12b2, redsn0w will now explicitly ask users with limera1n-able devices whether they want to inject rocky-racoon using the DFU ramdisk method, ro the backup/restore method (the ramdisk method is better for those with lots of media on their device that would create very large backups, and it’s required for those with unactivated iPhones). If you’ll always want to use limera1n, you can select that in the Preferences pane. It also fixes an iBooks issue an old-bootrom 3GS iPhones, and provides more useful error messages when things go wrong.”
If your device is already jailbroken, you would not need to re-jailbreak using this new version. However, you can use it if you have that iBooks issue on your 3GS.
Source: iDownload Blog