VK810 bricked. Need help topic

I could sure use some help. I rooted my VK810, then...using ROM Toolbox....I changed the start up animation. That was the wrong thing to do. Now every time I restart the tablet, in portrait mode, the screen stays black. In landscape mode, only the right 1/3 of the screen is visible (the rest is black). It does not matter how I turn the tablet, it's always the right side that is black. I have tried several Master Resets. Occasionally that will bring the screen back (tho usually not), but every time I restart, I'm right back to square one. I really need to reset it back to stock, but I'm finding VERY little information on how to do this. Any help would be GREATLY appreciated.

btw....the tablet did upgrade to 4.4.2, before it was rooted.

Thanks,
Dan