1. Turn off the phone.
2. Now press'n'hold the Volume Up + Power buttons for five seconds.
3. Let go of them when the Boot Mode opens.
4. Select Recovery. Wait for the Android robot to appear on-screen.
5. Press-hold Power for a moment. While holding it, press Volume Up.
6. Yaay, you are in Recovery Mode. Navigate it with Volume buttons; select options with Power button.