Redsn0w 0.9.12b2. few days back Redsnow 0.9.12b1 was release by the iPhone Dev Team for untethered jailbreak Apple’s iPhone 4,iPhone 3GS, iPad, and iPod Touch 3G, iPod Touch 4G running Apple latest version iOS 5.1.1. Now here today again iPhone Dev team released another update of Redsn0w. Redsn0w 0.9.12b2 will now explicitly ask users of A4 or lower powered iOS devices if they want to inject rocky-racoon using the DFU ramdisk method or the backup/restore method.
From Dev TEam
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 or the backup/restore method (the ramdisk method is better for those with lots of media on their devic% 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 on old-bootrom 3GS iPhones, and provides more useful error messages when things go wrong.
Here are the Download link of Redsnow 0.9.12b2 For Windows & Mac which are given below.