Hey guys it is pilover123 and today i will tell you how to GPD mod Halo 4. You will need horizon, a USB flash drive, and of course a computer. The 1st thing you have to do is go on horizon with your profile on your USB flash drive and extract the 4D530919 GPD from your profile and save it to your desktop.Next you will simply want to go to [ Register or Signin to view external links. ] scroll to the bottom, click on Halo 4 and insert your GPD where it tells you to. Once your GPD is inserted on to the website, you can add pretty much anything you want on to Halo 4. I personally have never tried modding my xp,and truthfully, don't recommend doing so. Make sure you click ovverride item after you choose what you want or it will not stick. When you are done modding what you want, go to where you first entered your GPD in the first place, and click save. Once you click save the website will give you your modded GPD on the right. Right click and choose "save to" and when your new GPD saves, rename it 4D530919.GPD and replace your old GPD with the new one in horizon. Once your done save, rehash, resign and plug your USB into your xbox. After your done with that make sure you either unplug your adapter, wired connection from your xbox, or disconnect from the network you are using. Sign in while you are still offline then you can plug in your cable, adapter, or connect to your router, but when it says sign out to test your connection, click no, and go into Halo 4 offline. Once you see it works, connect to xbox live and play a game to make sure it sticks. I hope this helped