@sven https://forum.xda-developers.com/t/op6t-latest-10-3-8-collection-of-unbrick-tools.3914746/ open this page download the oxigen 9 and the tool,is very easy,but you must do this with windows

Many thanks for the guidance and the warnings. And noted that the updates may/will over write whatever I have installed. I have 2 Nexus 5 phones. One has hardware issues but works as my Guinea Pig device for trying something new in uncharted waters for me.

Hi and welcome @rbhawk I moved your post to Devices/Google/Google Nexus 5 It seems your issue is related to this specific hardware and features so a better help may come here. Sorry, I cannot help more as I never tried to cast video signal to another device.