1. First of all, turn the device off by holding down the Power key.
2. Now press & hold the Volume Up + Power button for a while.
3. Release held buttons when an Asus logo shows on screen.
4. Press Volume Down to choose Recovery option. Confirm the choice with Power button.
5. Done, you're in the Recovery Mode.
6. Use Volume buttons to navigate the options. Press Power button to select them.