Just purchased a AX5400 Pro version 1, FW version 1.0.2 build 20221129 rel. 31896.  I have been setting it up while connected to a laptop via a LAN port. WAN is not connected. Due to various static IP addresses on my network, I converted the default IP from 192.168.0.1 to 1.1. I go in and set all the settings, entering my static assignments. Everything works fine until my last few steps. When I go to change the WAN port from 2.5 to 1.0 the router initially accepts it. Then it asks me to assign the subnet for 191.168.1.1. I assign 255.255.255.0. I get a red warning saying you cannot use this subnet. Then the router locks up and becomes a brick until I do a hard reset. If I leave it on 2.5 no issues but I don't have a 2.5 connection. My connection is capped at 1. My questions are, any ideas why the router is locking up when I try to assign the 1.0 as the WAN port? Can I just use the 2.5 port even though my service is just 1.0?