[Q] Bootloop problem after editing in "Build.prop" in Micromax canvas2 plus topic

I am using Micromax canvas 2 plus mobile... i am new in rooting process, few days before i changed "build.prop" in my phone and it was working fine but now i replace the default "build.prop" file and rebooted my phone and stuck in "BOOTLOOP" problem. please friends help me, i am totally messed up.
i have a backup of "build.prop" file in my PC and in my mobile also but i am not able to fetch it.