1. Turn off the phone.
2. Now press'n'hold the Power & Volume Up buttons. Let go of it after the Boot Mode appears on the screen.
3. Enter Recovery Mode by pressing the Power button.
4. Android robot will appear on the screen. When it does, press and hold Power button for a few seconds.
5. As you hold it, press the Volume button just once.
6. Navigate Recovery Mode with Volume & Power buttons.