iPhone Dev team has pushed out a new version of Redsn0w with some bug fixes, improvements and iOs 5.1.1 support. This new version of Redsn0w fully supports iOS 5.1.1 and you can jailbreak your A4 device without any problem if you have updated it to iOS 5.1.1.
Changes in this version include:
“Version 0.9.11b3 should fix the spurious “Restore failed” messages people were sometimes getting, and it behaves better with nearby devices that have wifi syncing enabled!
Version 0.9.11b4 completes flagyl online the tethered JB support for 5.1.1 on A4 devices and earlier, including proper “Stitching” and “Custom” creation of NO_BB IPSWs.”
you are looking to jailbreak your iOS device using redsn0w, then you should be using this latest stable version to avoid any errors. You can also use this version to downgrade iPad 2 or iPhone 4S. Download links
are given below:
Download RedSn0w 0.9.11b4 for Windows
Download RedSn0w 0.9.11b4 for Mac