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Hidden Devils
Re-wrote and added your method to the OP and gave due credit. Thanks for providing support to people in this thread as I've been quite busy these days.start with a fresh GPD (redownload profile)
*I disconnect Ethernet cable after DL profile.
extract with horizon
edit with whatever program ur using i would think you're using, horizon/eclipse/adbsurdlyobfuscated
follow through with your modded settings and save
inject modded GPD into profile with horizon, save
eject drive and plug into xbox
start up Halo 4
select storage device - select an alternate storage device other than the one the profile is actually on (usb vs hd)
start custom game match
i plug mine in around the time starting the custom game (during the countdown of the actual game starting)
end the game after 5-10 seconds
press start, go to network, select xbox live
play online in MM for a bit and you should have all unlocks you put on your account online while your playing