https://drive.google.com/drive/folde...nFJQUMweGo4cm8
I think that's the latest firmware for M96 from onyx website
https://www.boox.com/downloads/#others. As for whether it's 4.4 android update, I don't know.
It should be able to handle videos, but I don't really see a point in doing that. The quality will be bad. It'll be black/white only. I'm able to play youtube videos without any problems though (just for test purpose).