Canvas a1 not importing data from oem.prop

I always trying new rom and i use cwm recovery but after flashing cm12 beta 5 my phone stop importing data from oem.prop now in phone model it is showing unknown i check oem.prop and that is fine and when i copy data of oem.prop and paste in build.prop then phone model show right model so i need help to make my phone import autonatically data from oem.prop