Reference

Resetting Your Tablet Device

If your tablet device is not performing as expected, and you cannot force-quit your tablet device by pressing and holding the power button for about 10 seconds, insert a pin or other slim object into the reset button (hole). You will be able to force your tablet device to shut down.

Note

Pressing the reset button (hole) will not revert settings to factory default.

If you press the reset button (hole) and turn off your tablet device, unsaved data will be lost.