Change your gamertag with Horizon
1.Put your usb flash drive into your xbox 360
2.transfer your profile over the your usb flash drive
3.Plug it into your pc and run Horizion.
4. Double click' on your profile
5.Here you can see your name and crowns etc. - Just edit your name
6.rehash and resign then transfer it back onto your xbox and your done!
Actually this'll give you a error that makes the profile don't work, Horizon able to mod/recovery your account not change gamertag.
I May try this today 🙂
It'll correct your profile you can not Change you gt in horizon that's fake
i have tested this and isn't working, thread is locked