Is the tablet totally bricked now or are there any suggestions?
You should've replied with a quote like my signature says so I'd reply you quicker.
I've heard about this pins shorting, but make sure you short the right pins of your very own device as this stuff - when done wrong can kill your device.
Send me the updater-script from the zip that you have made, but first dig the Web for recovery flashable firmware of your tablet. You just might eventually find it.
Okay, I opened the tablet and apparently the NAND chip is made by Micron?
The code is: 29F64G08CBABA
According to this thread Onda V811 uses same chip:
And the user in that thread apparently did find correct pins but unfortunately the attachment does not work.
EDIT: Here is more discussion about that:
Now I have to figure which pins to short.