1. Turn off your tablet.
2. Press and Hold VOLUME UP and Power button. Unpress power button when you see Lenovo logo, until you see the "No USB Cable connected".
3. Press VOLUME UP and VOLUME DOWN simultaneously to reveal the recovery mode. Keep pressing, sometimes it takes 4 times until it goes through the recovery mode.
4. Select FACTORY RESET, press Volume button to navigate and press POWER Button to confirm your selection
5. Reboot.
6. Smile.