k fest, try this, but be aware you may/will lose your data:
Make sure tablet is powered off.
Hold down Volume + button and Power button at same time.
When screen comes on let go of Power button.
When the large Android shows on screen let go of Volume + button.
Use Volume – button to scroll to Wipe Data/ Factory Reset
Tap Power button to select.
Use Volume – button to scroll to Yes.
Tap Power button to select.
Tap Power button to select Reboot System Now.