I shutdown the computer and then plugged the cable into the HDMI#2, turned it on and noticed that the initial BIOS (F2 or Del) screen showed up momentarily as did the Initial Windows 10 Window screen with pinwheel turning for a moment and then all went blank.  I?™m surmising that the same 4k@60Hz setting that I had set up with the DP to HDMI adapter was ALSO being used for HDMI#2 and it couldn?™t do the 60Hz refresh until the firmware got updated.  So I again shut it down (from Teamviewer) and connected a DP to HDMI adapter (Club3D model mentioned in other posts designed to work with DP1.2 and HDMI 2.0.  It did!)  to the DP port and my HDMI cable to the adapter.  It booted up fine in 4k@60Hz.  I then changed it to 4k@30Hz and shut it down again.  Then I reconnected the cable to HDMI#2, turned it on and it booted up fine in 4k@30.  I then started the firmware updater, which showed the correct initial screen?¦â€ťabout to update from 1.24 to 1.36??  So far so good.  I clicked Update and everything worked fine.  It updated, screen went blank, reset itself and it came back again with success.  I then went into the Graphics Display program and changed the refresh from 30 to 60 and it stayed.  Yes.
               
My conclusions:
I?™m unsure whether reverting to the 4300 version of the Intel HD Graphics 530 drivers had an effect, but maybe.
The correct sequence of events for installing the firmware are:
1)      Ensure you have the requirements met, like dual channel memory and maybe the 4300 version driver
2)      Plug cable into HDMI#2 (not HDMI#1) and boot up in 4k@30Hz
3)      Run the firmware updater from there.  It should work.
4)      Change refresh to 60Hz and apply.