- Press and hold the On/Off button for at least 5 seconds.
- Release the On/Off button.
- Press and hold the On/Off button for at least 10 seconds.
- Release the button and wait a few seconds.
- Press the On/Off button again.
- Press and hold the On/Off button and the "-" button simultaneously for a few seconds.
- In the menu that appears, use the "-" key to select the "Reboot" option.
- Connect the tablet to the charging cable and allow the tablet to charge for several hours (even if the display indicates that the device is already fully charged).
- Repeat "Tip 1", "Tip 2" and "Tip 3".