1. Power off the device by pressing and holding the Power key.
2. Press both Volume Up and Power button and hold them for a few seconds.
3. Feel free to release held buttons after an Asus logo appears on screen.
4. Now choose Recovery option - press Volume Down to select it and Power button to confirm.
5. Woozah! You've reached the desired mode!
6. Scroll through the options using Volume buttons; select them with the Power button.