4.0.1 beta1 - adguardhome not working Flint/SlateAX - DoH Security Problem

No, I have not changed settings in adguardhome because I can’t access the setting page.

I upgraded the firmware to the latest release, I kept all the settings the same.

How did I do what? Changed the back-end config files? I ssh into router and modified the NextDNS address in the public-resolvers.md file as you suggested in this post here.
Screenshot 2022-07-12 142017