OrbiPro SXR30 -- trouble recovering admin password

I would like to thank Michaelkenward for his thoughtful reply; he described my situation to a “T.” Before I actually conduct a factory reset on my OrbiPro SXR30, however, I would like to confirm whether such a step is a necessary to eliminate a false “No Internet access” indication and a browser “Captive portal detection” message that occurs following my change in ISP. I recently changed my Internet supplier from a rural neighborhood wireless network to Verizon FIOS, and merely moved my Orbi router’s Ethernet WAN port connection from the former modem to the present Verizon Optical Network Terminal (ONT).

The Internet access supplied by FIOS actually works very well; however, my Windows “Network and Internet” status now displays “No Internet access”, and every browser insists that I “log in to the FIOS network before I can access the Internet”, supplying a “Captive portal detection” page for added information. Verizon FIOS needs no such login to obtain Internet access. If I connect to the WIFI network from the Verizon router provided by the FIOS installer, I get no such messages. However, I prefer to use my NetGear OrbiPro SXR30 mesh router system in order to obtain better WIFI signal strength throughout both upstairs and downstairs levels of my house.

Can you confirm that the best way to eliminate these problems is to repeat the NetGear router’s Internet setup process, employing, say, the Internet Setup Wizard? It appears that I need to do a “factory reset” on this router to accomplish this.