I'm again trying to help my next door neighbor with his working home network. As described in my previous post back on 4/16/23 (3-node Deco M5 mesh configuration behind T-Mobile Home Internet Gateway)

I am helping my neighbor configure his 3 node TP-Link Deco M5 mesh network in a large house with structural masonry walls that prevent full WiFi coverage from the T-Mobile's Gateway WiFi. The Deco mes