Thanks for the response, @Kevin_Z . I'm not sure I made myself totally clear. Basically I wasn't seeing even the hidden SSID on the upper-5GHz band that the Deco's use for backhaul. However, after...

So I don't yet see the changelog for this particular build on the M9 Plus support page, but I did briefly read the changes when I performed the update. Didn't seem to be anything pertaining to my...