The new folder /srv/chirpstack/ incl. the SQLite DB chirpstack.sqlite
was created. Size 78 MB
At least some data was migrated 
unfortunately nothing starts the LED (red) bink 2x then 1 sec, pause, then again 2 x… endless.
I’m not sure what is causing this and it will be hard for me to debug / resolve without having access to your Raspberry Pi. If LuCI is not starting, there might be an other issue. What you could do is create a backup (maybe to be sure both the PostgreSQL + SQLite + Redis), then perform a factory reset and after re-configuration copy back the SQLite + Redis files to restore the ChirpStack state.