After Nate True went rogue and released a very clunky Jailbreak for 1.1.3, the Dev Team changed plans and released an official method. Luckily, the new way is a hell of a lot easier than the old.

The process is very straightforward but requires a lot of patience and knowledge of what you’re doing. Take it from me, it can be a very long process if not done right.

You can find multiple guides online but keep in mind that if you are hoping to Jailbreak 1.1.3, you’ll have to be on 1.1.2 Jailbroken already. You can downgrade but the process is very tedious and you’ll be mucking around with the Base Band. 1.1.3 upgrades the Base Band for Google Maps’ Locate Me feature, downgrading does not change the BB at all and changing the Firmware prevents you from calling until you upgrade back.

As always iPhone Atlas has a very detailed guide on the procedure and iClarified has a very thorough walkthrough for Windows, Mac and running it directly from your iPhone.