Many thanks for the quick reply!
That really makes grey hair... but ok. Im waiting for the next major release and make everything new.
To make it better next time:
- fresh install of OpenWRT XX.Y
- install all packages as needed + usb, ext 4...
- setup the stick as /opt/
- manually install AdGuard Home to /opt/ and keep it there even when updating OpenWRT (is [How-To-Updated 2021] Installing AdGuardHome on OpenWrt [Manual and opkg method] the latest and most complete guide to do this?)
When doing the next upgrade, what about the packages and settings in that case? Run upgrade via luci and having fun, or manual export of packages and reinstall every single one?