1. Turn off the phone by pressing and holding Power button.
2. Press-hold the Power and Volume Up buttons.
3. Boot mode will appear. Let go of buttons held.
4. Enter Recovery Mode by using Volume Up; confirm your choice with Volume Down.
5. Android icon will appear. When it does, press Power button for a few seconds. Press Volume Up while holding it.
6. Yaay, you are in Recovery Mode. When there, use Volume buttons to navigate to options and Power button to select them.