@yves_b I tried what was mentioned in the article, but even updating firmware on both the Archer AX10, and the Deco X55, but the Deco didn't seem to offer any easymesh support, and the Archer can't...

Seems I purchased the wrong mesh extenders for my router - an Archer AX10 I ordered, and received, 3 Deco X55 units I wanted to extend my Archer router with a unified wifi ssid to the downstairs, and...