just to share my experience with latest NUC6CAY-NUC7ixBN-HDMI-Update-1.72 fw on my nuc7i3
that version does not allow me to set "HDMI UHD Color" on my Samsung TV (2017 model 4k) UE43MU6172.
All goes blank for some 10 sec, then the signal is lost, then blank again etc.
If I remove the UHD option all works smoothly.
I then came back to version 1.71 that does not have this issue (luckily I found a link to that version...Intel does not have driver archive? I could not find)
I understand that you were getting issues with the UHD color of the Samsung TV after upgrading the HDMI firmware.
First, I would like to apologize for any inconvenience caused. Also, I would like to thank you for taking the time to provide us with this feedback, we are going to be looking into this and fix any problems if applicable.