Enable Soft Keys on Rooted Android Devices
Method #1
Editing Build.prop File
Steps
To enable soft keys, you need to edit the build.prop file.
Open ES File Explorer app.
Go to /system. Copy the build.prop file and paste it in the SD Card. Now we have the backup of the build.prop.
Again go to /system and tap the build.prop file. Select ES Note Editor option.
Click on overflow menu at the top and select “Edit”.
Add the following lines at the end
qemu.hw.mainkeys=0
Press back button and select “Yes” in the confirmation message.
Reboot your phone.
Now you can see the soft keys on your Android phone.