Please download the HDMI 2.0 firmware from the following link:
Please follow the steps at the following link in order to install HDMI 2.0 firmware:
Umm... Since I only have the one HDMI display, and it's not 2.0, I can't verify that. But the instructions say that if the device isn't HDMI 2.0 that I'll get an "IOU error!" but the upgrade will continue after that. Are the instructions wrong?
Regardless, I'll try the new link that Ivan provided in a couple of days when I'm back in front of that NUC.
It turns out that the link you send me was to the same version I'd already been using.
When I try using it, it gives me an "IOU" error jsut after the apapter is detected, and if I continue on, I can get to the point where firmware loading dialog is shown, but it doesn't show the bootloader version, firmware version or the current device (all those fields are just blank.)
Please be aware that there can only be one video device plugged into the HDMI 2.0 port and it MUST be HDMI 2.0.
Nothing can be plugged into the mini DisplayPort or Thunderbolt™ 3 ports.