Flashing other carriers firmware on a moto X is not a great idea, unless you KNOW it to be safe. And also remember on the X, trying to downgrade from 4.4.2 or higher, can lead to a brick....even a permanent brick.
Here is a thread that may help....
>*Moto X*>*Moto X General*>*[HOW-TO] Resurrecting A Bricked Moto X
You can ask for further help in that thread also.
Hope you work it out!!
---------- Post added at 10:42 PM ---------- Previous post was at 10:37 PM ----------
This is another option to try. But no matter what method you try, you MUST use the firmware for YOUR device, not a different carriers....and the same android version you were on. Again....DON'T downgrade a Moto X that is on 4.4.2 or higher already....ever.
>*Moto X*>*Moto X General*>*[GUIDE][VIDEO] Moto X - Return to 100% stock (using RSD Lite OR manual flash)