First of all thank you very much for this detailled solution.
I planned to do it these days. To check an usb-c ethernet adapter (completely a different topic) i plugged it into my eos phone. I saw it is working. By chance and i am still not sure if this is related to the adapter, i saw that the message “no internet” was gone. Maybe already before, i am not sure. I checked the app store which was always complaining and yes also this worked! So i made no upgrade and no change as proposed here and nevertheless it works now. Crazy.
Your help here in the forum is awesome. I take this opportunity to say this to all of you. Thanks!!