A:Answer Looks like someone got it to work.
"Go into the advanced Roku settings in the TV, and select the input you have the computer hooked into. You can choose the HDMI mode, 1.4, 2.0, or auto. Auto fails; 2.0 works."
Source: https//forums.redflagdeals.com/best-buy-sharp-43-4k-uhd-hdr-led-roku-smart-tv-449-50-649-2123673/3/