Default Can't connect to 3g or 4g unified roms

Ok i hope someone can help me with this
Mi problem is
When i install a unified rom i only have 2g i can't connect to 3g or 4g and this happens to me in every unified rom
And also a friend have the same phone but he doesn't have that problem and i unlocked and rooted his phone

I have a xt925 my carrier is telcel I'm from mexico
And sorry if my English is bad

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