He encontrado esto en el foro de facebook, quizás os ayude
Be careful!!!!!! There is a bug in ROM B370, in build.prop there is this line (telephony.lteOnCdmaDevice), is with 1 value and dont let you choose from 4G or gsm, same people get stucked in gsm, no way to change with out root... to fixed must change to 0.
With bootloader unlocked its possibel to root with rootgenius.