@ToasterRGB
Did you manage to get your T80D back to life?
Mine also has the black screen and if I connect it to the RKDevTool v2.58 the tool sees it with "Found One ADB Device".
I tried to switch to "Loader Mode" but it does not switch although the status window pretends so (see
https://www.dropbox.com/s/fvqsl4uo4b...vTool.jpg?dl=0)
When I go into recovery menu mine says:
rockchip/rk3368/rk3368
8.1.0/OPM8.181205.001
It looks to me like it had updated at least something before it went black.