Use iFaith Signed IPSW for iOS 6.1.3 Downgrading to 5.1.1 on iPhone 3GS
Step 1. First download iFaith 1.5.6 and unzip it.
Step 2. Run iFaith as administrator. Click “Show Available SHSH Caches on Server” and connect your iPhone 3GS to PC using USB.
Step 3. After the program detects your device choose the blobs you need. In my case I choose for iOS 5.1.1 because iFaith gives error if you choose for 6.1.2.
Step 4. Download selected blobs.
Step 5. Now go to the main menu and choose “Build *signed* IPSW w/Blobs” and then “Browse for SHSH Blobs” and choose SHSH file you need.
Step 6. Now you can choose or downloaded earlier iOS 5.1.1 firmware on your computer or allow iFaith to do it for you.
Step 7. After which iFaith starts to create iOS 5.1.1 custom firmware for 3GS, so relax and don’t interrupt the process. This firmware file will be saved on your desktop.
Step 8. Turn off your iPhone and download iReb r7. Unzip it, run as administrator.
Step 9. Choose your device from the list in iReb and prepare to enter DFU mode.
Step 10. After you will see the message to connect to iTunes, launch this program and holding Shift click the Restore button. Choose the file saved in step 7 and wait till the end of the process.
Now you ca see that your iPhone is running iOS 5.1.1 after iOS 6.1.3 downgrading with iFaith. The last thing you need to do is to wait for new untethered jailbreak for 6.1.3 firmware version
how to downgrade iso 6.1.3 to 6.xxx 5.xxx 4.xxx
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