I need a help I have lava iris x5. Soft key of that ph r not working I tried to flash

I need a help I have lava iris x5. Soft key of that ph r not working I tried to flash but it's not connecting and even I tried to install app name "back button" it's asking for accessible permission but noting z displayed in accessibility and even tried many apps* but noting was successful.* Even I tried to navigate to system >>build.pro. it couldn't find dat files please help me sorting out this problem.

Thank you.
Murthy.

from xda-developers http://ift.tt/294BpWo
via IFTTT