exactly the same for me. 🙁 Instructions do not work, now try with the direct connection.

When the LAN cable is not connected, I can access the menu via WiFi using the address (http://renkforce.setup). It's a bit strange but it works.

I have never called up the menu, just plug it in, connect it with the LAN cable and you're done.

You need to disconnect your computer's usual internet cable or wifi and restart it, then connect renkforce to your computer using a cable or wifi.