HDX software update issue

[Frank3]

I downloaded Skyview HDX 17.6 software using US Software Pkg Downloads. Installation to #1 HDX worked fine. #2 HDX attempt to download received msg "Incompatable Software Version". After exiting #2 HDX, I received warning msg on #1 HDX "EMS SFG file mismatch".

#2 HDX is newer Firmware than #1.

Suggestion on how to fix??

Thanks in advance

 

[Rhino]

Turn on each display individually, and update them alone, without the other powered on.