@abe This is a one time issue – for this upgrade only. You should be able to restore settings as usual after this.
After reset, you’ll do the initial set up again. At this point, you’ll configure the WiFi. Confirm that you have only one SSID after initial setup.
Then you can restore your backup, but choose “Access Control” only. And that should not change your WiFi configuration. Verify again that there’s only one SSID.
Then manually update Dynamic DNS, Cloud and other settings if needed.
Finally, save a new backup.