Downgrade to KitKat on Micromax YU Yureka Micromax YU Yureka is not working properly after upgrading. When we place a call, the screen goes blank and I'm not able to receive or decline the call.

I want to downgrade to KitKat, how to do it?
I faced the same problem. Follow these steps and your problem will be solved:


Dial this code *#*#7769#*#*. One proximity info will come.
Press start and wait until your phone proximity info is shown on screen
Press exit.