If you want to downgrade iOS on iPhone or iPod, you should have :1. iFaith latest version (http://qwertyoruiop.com/static/mirror/iFaith-v1.5.8.zip)
2. iREBrc7 you can Download here (http://qwertyoruiop.com/static/mirror/iREB-r7.zip)
3. IOS 5.1.1 SHSH Blobs file. you can requests from Cydia server, use TinyUmbrella or iFaith.
4. iTunes Latest version
5. iOS 5.1.1 is compatible with your iPhone or iPod.
Below is the example of downgrading iOS from 6.1.3 to 5.1.1 ( You can try the same method for other firmwares )Step 1: Open iFaith By Way, Right Click and select "Run As Administrator"
Step 2: On the screen iFaith, Select "Build * signed * IPSW w / Blobs" Then select "Browse for SHSH Blobs" Search iOS 5.1.1 SHSH file and click Open.
Step 3: Next, select "Browse for an IPSW" and Find Files Firmware iOS 5.1.1 that you download or prepared beforehand.
Step 4: Wait Until iFaith finished making a CTF file, so you just be patient enough, might use the time to 5-10 minutes.
Step 5: After iFaith finished making CTF file for your iPhone or iPod, please check the file, usually stored on your computer desktop.
Step 6: Next, iFaith will automatically guide you to position your iPhone or iPod into DFU Mode. But at this moment, we do not Using iFaith to position your iPhone or iPod into DFU Mode. So, Close iFaith
Step 7: Open iREB r7 that you downloaded earlier, By Way Right Click and select "Run As Administrator"
Step 8: Once your iPhone or iPod is detected in iREB r7, On the iDevice menu options, Please Choose according to your iDevice have.
Step 9: At this Moment, you will be guided by iREB r7 to position your iPhone or iPod Touch into DFU Mode. Please Follow the instructions that show on the screen of iREB r7
Step 10: After successfully position your iPhone or iPod Touch into DFU Mode, Close iREB r7, And Open iTunes, Now In iTunes your iPhone or iPod Touch will be detected as Recovery Mode.
Step 11: In iTunes Press and Hold down the Shift key on your computer and then click "Restore" in iTunes. Then Select the File CTF was created using iFaith, this file is usually located in your Desktop Computer.
Step 12: Please Wait Until Restore Process to be done. and enjoy iOS 5.1.1
Please note : Above procedure is 100% working ( I did downgrade and jailbreak my iPhone 3GS successfully recently (6th June 2013))
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