BUMP: 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 here