Today is the big day for iPhone 4S, iPad2 and iPad 3 users. New version of RedSn0w 0.9.11b1 has been recently launched by iPhone Dev Team. You can use this updated tool to downgrade iOS 5.1.1 to lower version for untethered jailbreak. If you are A5 device user then you know that there is no untethered jailbreak for iOS 5.1.1 and 5.1. So you can downgrade your iOS to 5.0.1 and use Absinthe to jailbreak it. However I have to tell you that iPad 3 can't be downgraded to iOS 5.0.1, only to 5.1 (but there is tethered jailbreak for it.) Here I will show you how to make this downgrade using RedSn0w. But before we start read these requirements.

Requirements

1. SHSH blobs of the firmware you want to downgrade to.
2. You have to save your SHSH blobs locally or in Cydia. Tutorial guide how to do that is here.
3. If you are iPhone 4S user then you need to point RedSn0w at the 9A405 version of 5.0.1 (not to 9A406).
4. Firmware files to which you want to downgrade to. You can use this link to download iOS 5.0.1 (9A405 for iPhone 4S)
5. Firmware files of your iOS 5.1.1 (here is download links).
6. RedSn0w 0.9.11b1 tool.
7. iPhone 4S or iPad 2 or iPad 3.
8. RedSn0w 0.9.11b1 tool.
9. USB.

Update: As talking about requirements number 3 and 4, I can tell you that with new RedSn0w 0.9.11b1 it is possible to avoid that becouse the new version brings fixes for 9A406 version of iOS 5.0.1 for iPhone 4S. So if you are iPhone 4S user then go here to download RedSn0w 0.9.11b2 and perform this tutorial guide.

How to Downgrade iOS 5.1.1 on A5 Devices

Note: This method works only on iPhone 4S, iPad 2 and iPad 3. So if you use A4 device then go here for downgrade. Step 1. Open RedSn0w 0.9.11b1. (Run as Administrator if you are Windows user.) Step 2. Use USB to connect your gadget to Mac or PC. Step 3. After connecting you iGadget now you need tu put your iPhone in the DFU mode. Detailed information how to do that is here and perform it. Step 4. Click Extras => Even More => Restore. Step 5. Now choose IPSW and point RedSn0w to the firmware file you want to downgrade to. Then you see RedSn0w asking you for the iOS 5.1.1 files. Step 6. Now point RedSn0w to the .plist file (which has your SHSH blobs) by clicking Local. If you have saved your SHSH blobs in Cydia click Remote. Step 7. Click Next. Step 8. This process is automated where RedSn0w will automatically stitch the SHSH blobs to the IPSW firmware file that you just supplied, after which it'll restore to it. Also you can see the video (downgrading on Mac) where if you are not sure about something: Don't worry if it will take some time. The process will end automatically. If everything was right then you successfully downgraded iOS 5.1.1. Update: Forget about Absinthe! Now you can jailbreak iPhone 4S and iPad 2 untethered using RedSn0w 0.9.11b2. So go HERE quick to know how to do that! I hope this process was easy for you. If there are some questions then leave them in the comment section below.