Hi I had the exact problem on the chromo android tablet, 1st thing you need to do is power off the tablet. Then press and hold both volume up and volume down key, while holding, press n hold power button for a sec to turn it on, continue holding both power keys, once powered on the screen will go blank but it will be illuminated with a black screen, release volume keys and punch volume up or down key to access recovery menu navigate menu with vol keys use power to select the options