Jailbreak iOS 6.1.3 On Pre-A5 iPhone And iPod Touch Using Redsn0w

Compatibility:

• iPhone 4, iPod touch 4, iPhone 3GS

Things which you will need:

• Redsn0w 0.9.15b3 [Windows / Mac]
• iPhone 4/3GS, iPod touch 4th-gen running iOS 6.1.3 final.
• iOS 6.0 IPSW.

Before you go ahead, keep in mind that this is a tethered jailbreak and will require you to plug your device into your computer in case you wish to reboot your device. With that aside, lets begin.
Step 1: Download the original iOS 6.0 from the link provided above.
Step 2: Download and fire up Redsn0w 0.9.15b3 and run it. Download links above.
Step 3: Click on the visible Extras button and choose Select IPSW. Point Redsn0w to the unmodified iOS 6.0 IPSW you downloaded in step 1.
Step 4: From Redsn0w’s main screen, simply click on Jailbreak and follow the easy on-screen instructions. When prompted, choose to install Cydia.
Step 5: When instructed, enter DFU mode with the help of the Redsn0w wizard.
If all has gone well, Redsn0w will now start doing its magic in the background: jailbreaking your device using the Limera1n exploit and installing Cydia in order for you to install and run third-party tweaks or packages. This process should not last more than just a few minutes.
As we mentioned before, this is a tethered jailbreak, and your device will be stuck on the dreaded Apple logo if it reboots for some reason or loses power. To boot it into the jailbroken state again; simply connect your device to your PC or Mac, launch Redsn0w, click on Extras and click on the Just Boot option, and you’re done.