A tethered jailbreak means you will need to connect your device to the computer each time you reboot. If you are on iOS 6.0 through iOS 6.1.2, please do not update. Rather use the iClarified Jailbreak Wizard to find instructions on performing an untethered jailbreak with Evasi0n.
Create a folder on your desktop called Pwnage
Download the latest version of RedSn0w from here and place it in the Pwnage folder. Likewise, download the 6.0 and 6.1.3 firmware from here and place it in the Pwnage folder.
Extract the RedSn0w zip file to the Pwnage folder.
If you haven't already updated to iOS 6.1.3 then launch iTunes and perform a backup of your device.
Select your iPhone from the list of devices on the left then hold down Shift and click the Restore button.
Navigate to the Pwnage folder on your desktop and select the 6.1.3 firmware ipsw. Click the Choose button to continue.
iTunes will now update your iPhone to the new firmware.
**Important: If you want to keep your UltraSn0w unlock then follow these instructions to update.
Right click or control-click the redsn0w application from the redsn0w folder we extracted earlier and choose Run as administrator from the popup menu that appears.
Once RedSn0w opens click the Extras button.
From the Extras menu click the Select IPSW button.
Navigate to the Pwnage folder on your desktop and select the iOS 6.0 IPSW then click Open.
You'll be informed that the iOS 6.0 IPSW will be used for the rest of the session. Click OK.
Click the Back button and then click the Jailbreak button from the main menu.
RedSn0w will now prepare the jailbreak data.
Ensure Install Cydia is selected from the options menu then click Next.
Turn OFF your device then click the Next button
RedSn0w will now guide you through the steps to get into DFU mode. You can find more help with DFU mode here.
Hold down both the Home button and the Power button for 10 seconds.
Release the Power button and continue holding the Home button until RedSn0w detects the device.
Your iPhone will now be exploited with limera1n.
RedSn0w will now reboot your device.
RedSn0w will upload a new RAM Disk and Kernel.
Once this is complete you will be notified that RedSn0w is done and that this is a tethered jailbreak.
Once you have jailbroken you will need to rerun redsn0w to boot tethered.
From the main RedSn0w menu click the Extras button.
Choose Select IPSW from the Extras menu and select the iOS 6.0 IPSW. Next, choose Just boot from the menu and follow the instructions to put your device into DFU mode again for boot.
*A big thanks is owed to the iPhone Dev-Team and Geohot for their hard work and contribution to the iPhone community.
If you need help with this tutorial please post a question in the comments or submit a question to the iClarified community using our Answers section.