How to re-restore iOS 5.x.x on iPhone 3Gs, iPhone 4, iPhone 4s

I. Tools needed:

1. iTunes

2. USB cable and iPhone

3. Latest redn0w 0.9.15.b3

Windows users: https://sites.google.com/a/iphone-dev.com/files/home/redsn0w_win_0.9.15b3.zip?attredirects=0&d=1

Mac OSX users: https://sites.google.com/a/iphone-dev.com/files/home/redsn0w_mac_0.9.15b3.zip?attredirects=0&d=1

4. iOS 5.x.x .ipsw firmware file

5. shsh file, can be local saved or Cydia server saved

II. Get start:

1. Plug your iPhone 4s into your computer in a normal mode.

2. Extract redsn0w from the zip and run redsn0w as Administrator (Windows), right click Open or press Option key and click on redsn0w to open (Mac).

3. Click on Extras -> Even more -> Restore -> click on IPSW to browse for your 5.x.x ipsw file

4. Warning message will appear, read carefully, the message should be, if you click Yes your device will Not update to the latest base band that provides by Apple, (for devices that using gevey sim, SAM unlcok or ultrasn0w), if you click No redn0w will be updated your device to the latest base band.

5. After you click Yes or No, redn0w will ask you to put your device into DFU mode, click OK to go through the DFU mode process.

6. Now your device is in DFU mode, redn0w will allow you to choose your .shsh file either from the local or from the Cydia serve. Click on Local to browse for your local shsh or click on Remote to download .shsh file from Cydia server.

7. In this method i used Remote shsh then redsn0w will download your shsh file version that match with your .ipsw firmware version to combine with your .ipsw file.

8. Sit tight and wait for the update process to complete, the process will take a while around 5 to 10 mn.

9. Jailbreak your device with latest redsn0w or Absinthe 2.0.4 as you wish.

Bonus: Absinthe 2.0.4 can be download at http://greenpois0n.com/

Note:

iPad2 owners (all three models) with saved 4.x blobs can use those instead, even from 6.x

• if you have both 4.x and 5.x iPad2 blobs, you can always get to 5.x via the 4.x blobs, even if you’re currently on 6.x
• you cannot get to 5.x from 6.x without the 4.x blobs (but you may still qualify for the iOS5-to-iOS5 restore described above)
• if somehow you have 4.x blobs but no 5.x blobs, you can still go down to 4.x from 6.x
• this only applies to iPad2 owners (they’re the only A5+ devices that ever had a public 4.x FW)
• redsn0w still supports (but doesn’t require) jailbreaking A5+ devices at 5.0.1 and 5.1.1.  Just head back to the first page after re-restoring to 5.x.  It’s always much faster to jailbreak those FW versions with a freshly-restored device, before letting iTunes restore from a saved userland backup.

Good Luck...! :)