1. Power off the device.
2. Press'n'hold the Volume Down button for three seconds. As you do, press and release the Power button.
3. Select Recovery. Use Volume Down to navigate and Volume Up to confirm the choice.
4. Android logo will appear on the screen. Afterwards, press and hold Volume Up for a few seconds and, while you hold it, press Power button.
5. Well done, you are in Recovery Mode now.