How to Root Android Phone OR Tablet Using KingoRoot

Step 2: Enable USB debugging mode on your phone.
Android 4.0 or 4.1, tap Settings>>Developer Options >>USB debugging.(You may need to switch "Developer options" to On before you can do so.)
Android 4.2, tap Settings>>About Phone>>Developer Options>>USB debugging>>OK
Android 4.3 and later (including 5.0, though this also applies to some versions of 4.2), tap Settings>>About Phone>>then scroll down to Build Number. Tap it seven times, at which point you should see the message, "You are now a developer!"
With that done, tap Settings, About Phone, Developer Options, and then tick USB debugging." Then tap OK to approve the setting change.
Step 3: Run Android Root then connect your phone with cable. After few seconds the former should show a connection to the latter. Your device screen may show an "Allow USB debugging?" pop-up. Tick "Always allow from this computer," then tap OK.
Step 4: Click on "ROOT" and Wait until the operation is completed.