Downgrade topic

Hi, i install the uk retail 4.4.2 and i can call but i have no 4g or 3g or any kind of data, i try to downgrade but i have this message in my phone:

Downgraded security versión
Update gpt_fail versión failed
Preflash validation failed for gpt

Any way to fix the data or make a downgrade ???

Moto x, unlocked bootloader, claro chile

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