How To Downgrade iPhone 4 / iPod 4 from iOS 6.1.3 to iOS 6.1.2

Well , after the release of iOS 6.1.3 , Apple just stopped signing iOS 6.1.2 . As the newer version fixes four out of the six bugs used for the evasi0n jailbreak and it became just impossible to jailbreak the iPhone . After
stashing a lot of hours to work this , here you are . The ultimate guide to downgrade your iPhone 4 / iPod / iPad ( All pre A5 devices ) from iOS 6.1.3 to iOS 6.1.2 . Read the whole process after the jump .
First of all , this method will be able to downgrade only Pre A5 devices . To get started you'll need to download all the required files given below .

• Sn0wbreeze 2.9.7 : Download
• Redsn0w 0.9.15b3 : OS X / Windows
• SHSH of iOS 6.1.2 , don't have it ? Check out the tutorial here
• iOS 6.0 ( for your device )
• iOS 6.1.2 - you can get it from www.iosdl.com  or any other site .
• And to be on the safer side , have iOS 6.1.3 in your backpack .

So let's get started .

• Plug in your iDevice ( Close iTunes if it pops up ). Then , unzip sn0wbreeze that you downloaded before . Hit the big blue button in the bottom of sn0wbreeze screen . Then hit ' Browse for IPSW ' button , and select iOS 6.1.2 IPSW from the dialog box . Hit continue .
• Next select iFaith Mode and then browse for your SHSH for iOS 6.1.2 . Then hit build IPSW. Wait for it to finish building it , after it does it's job it'll show you how to enter Pawned DFU mode , follow the steps correctly and then you can close the app .
• Now head to iTunes , it'll detect your iDevice in Restore mode .
• Now for Mac users - Hit the option key and for Windwos users , use the Shift key while clicking the  'Restore iPhone ' Button . After that select the IPSW that sn0wbreeze built for you . And then wait for   iTunes to restore your device . 
• After it's done , you'll probably finish the process , but your device won't start . Don't worry .
• Next go to redsn0w ( Run it as Administrator ).
• Go to Extras .
• Then Select IPSW , in this select iOS 6.0 IPSW .
• Then go back , and hit Just boot .
• Follow the steps to enter DFU mode . And wait for Redsn0w to do it's magic .

* You might not be able to enter the DFU mode , so before clicking on the next button enter the DFU mode manually . Hold the power button for 3 sec , and hold power and home button together for 10 secs and thne leave the power button , but keep holding the home button for another 15 secs . Redsn0w will automatically detect it and follow up the process

That's pretty much it , you'll see the iPhone Welcome screen . 

NOTE : For now , your device will have tethered jailbreak , so don't restore your device via iTunes for now.

Go to Cydia and download the evasi0n Untether package . That's it , now you have Untethered - downgraded idevice .

After this , you can restore your device via iTunes . Stuck anywhere ? Fill in your comments below and we'll readily help you .