If the physical back, home and menu buttons are not working properly in android phone, that’s mean it’s a hardware issue, in this situation you have two option repair a phone or buy a new phone, but here I am talking about third option use a alternate, you can use a simple app to operate phone’s back, menu and home buttons, let see how to do this…
1. Go to play store download and install “Back Button (No Root)” app
2. Open the app it will ask for accessibility so tap on “Setting”
3. Tap on “Back button” and turn on the back button than “Ok”
4. On the screen you will see four button, notification, home, back & menu, just press the button it will work as back home and menu, you can use this app until you not repair or buy a phone.