@Xammo I fixed it to go to the gateway (IP of the router), login en reset to factory settings. After te reset, refresh IP of the client (when you have an different IP-range than default) and go to...

@Xammo The firmware can you download from here: https://www.tp-link.com/us/support/download/er605/. You can select the hardware version and the previous firmware

@Gfroza More people have the same problem: here and here are two topics

@PRAXXUS which version of Omada do you use? The combination of the new firmware and Omada 5.7.4 doesn't work.

@Loopo I have the same problem/loop. Omada 5.7.4 (linux) and ER605 v2.1.0. My network is also running. 'Clients' is empty. Port information (connection speed etc) is grey/not working. Downgrade won't...

I did try with Omada to downgrade the firmware. Omada can't do that because it looks like it has no connection anymore. I did a factory reset, try to adopt the router again. It keeps failing. After a...