1. Hold down the Power button until the phone turns off.
2. Now press-hold the Volume Down button for three seconds and, while holding it, press the Power button.
3. Select Recovery - use Volume buttons to navigate through the menu and Power button to confirm.
4. Android logo will pop on-screen. Pres-hold the Volume Up and press Power button, once.
5. Awesome, you're in Recovery Mode now. Navigate it with Volume buttons; select options with Power button.