Phones back, home and 3 lines not working (navigation bar)

[virusshah1997]

So my mom owns mi3, she dropped it once, now problem is we cannot use back home or any buttons(volume up down and power are working).

Is there anyway to solve this problem?

My phone is not rooted, but i am willing to root if its the only way to solve this problem.
I am even fine with those navigation bar above screen like in nexus 5 etc

Thanks in advance !

 

[Prashanth Meesara:]

Root your phone and add these lines to build.prop
qemu.hw.mainkeys=0