Turn tablet off, now press both up and dn. vol. buttons firmly and keep holding both at the same time.
Now press on/off button for 1 sec. no more. remain hold on vol buttons until Cromo appears then release. Give it a few seconds then press vol. up quickly. That should bring you to a menu.
Scroll down using vol. keys and enter with on/off. Reset and reboot, sounds simple does’nt.
It took me a couple or three tries.
Make sure you have a good charge on the tablet. One for yourself might not hurt either.