How can I re-set the WiFi network on my Class300 EOS? Example: after changing the WiFi password, changing WiFi router or Wifi repeter ...

You can set the connection between the Classe 300 EOS and your WiFi line from the device display, turn on the display, open the Settings menù (wheel) / Network

The wifi LED of your Classe 300 EOS will continue to flash red until the connection with the WiFi network is restored; at the end of the operation the Wifi LED will turn off.