Can I install 4G Roms on a non-4G Atrix? topic

Hey people,

I have a brazilian's Atrix, and it doesn't have 4G, and I need to install android 4.0.3 on it,
can I install the ROMs available on this forum or will it brick the device?
Is there I non-4G Atrix subforum (searched for it but couldn't find).

Thanks in advance.