If you haven't updated your iPhone in a long time but still want the benefits of jailbreaking, it might seem like you're out of luck because you can't jailbreak the newest version. Thankfully, it's easy enough to update to a version of iOS that you can still jailbreak. Here's how to do it.
Currently, the only available jailbreak for iOS is with version 6.1.2. Unfortunately, if you update your iPhone from iTunes it will push you up to 6.1.3 which you can't jailbreak. You can get around this by manually updating your device:
- Download the 6.1.2 update for your specific device from here.
- Plug in your phone and open up iTunes.
- Select your iPhone from the menu, and Option+Click the "Update" button.
- Select the IPSW file you downloaded in the first step and let iTunes run the update.
That's it! iTunes will perform the update and then you can proceed with the jailbreak. This works with any firmware as long you're upgrading from a lower version (you can't manually install 6.1.2 on a device that has already been upgraded to 6.1.3). Just make sure you don't accidentally let iTunes update it when you're done.