Groove CPE setup issues

Trying to setup a new RBGROOVEGA-52HPACN as a CPE, though it comes from the factory setup as a WISP AP.

I can power it up and bring up webfig via ethernet. After I select CPE from the quickset menu, I get a warning that I may lose connectivity while reconfiguring. After clicking ok, I indeed lose connectivity and am unable to get it back, even after waiting several minutes for a reboot, without factory resetting.

Any thoughts or troubleshooting tips?