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.