I lost all of my configurations when upgrading my home Flint from 3.x to 4.x.
Prior to the upgrade I backed up my configuration from the luci console.
After the clean upgrade when I restored the router just would not open the wireless page without errors.
I eventually fixed that by reconfiguring everything, but all of the Wireguard server and client configs did not restore and neither did any of the DHCP reservations…
What a royal disappointing pain in the neck restoring all that, it took hours.
Is there a trick to this, how do you guys backup and restore when doing upgrades?