Over the weekend the certificate on my 5G router expired - so I was initially unable to connect via the web interface.
This has just occurred on the H112-370 5G router (after 26th November 2023)
In chrome you can clear the HSTS cache, then connect via the Advanced button.
cf. https://www.ssl2buy.com/wiki/how-to-clear-hsts-settings-on-chrome-firefox-and-ie-browsers
But Three should be on top of this and provide firmware upgrades before the built in certificate expires
