Video of Y-20 sending supplies to Wuhan. You can see the dashboard at around the one minute mark.
Dashboard? You mean cockpit/cockpit displays?
At the one minute mark there are no signs of a cockpit/cockpit display, unless you're talking about 46 seconds in -- this part below? (the 1:06 number shows how much time is left in the video, not what time the video is at btw)
If that's the case, that is an Il-76 cockpit.... this video is a compilation of Y-20, Il-76 and Y-9 involved in the airlift yesterday.
We know what a Y-20 cockpit looks like. i.e.: full glass cockpit with large MFDs and ceiling mounted folding HUDs.