I was tripped up by this one myself until the firmware wizard explained the situation. To get back in, take a cat5 cable and link a mesh node with the problem unit, by connecting the two of them lan to lan. Plug your computer into either one on another lan jack and point your web browser to 172.27.0.2:8080

Note that base lan address of a mesh access point becomes x.x.x.2 and runs without a DHCP server while a mesh node is x.x.x.1 and provides the DHCP. Connecting them back to back allows you to share the lan while obtaining the DHCP from the mesh node.

Future expansions of DNS may include calling the AP unit "localap" in the style of "localnode".