Dialog reset methods not working

[strobotobi]

Your phone is connected the right network when you open Spark? Caught me out a few times

Also follow reset process with care - each and every step is important

Thanks a lot for your suggestions. Sadly none of the reset methods worked and I tried them all more than ten times very carefully. These are the two official methods: 
https://help.devialet.com/hc/en-us/artic...and-Dialog-
https://help.devialet.com/hc/en-us/artic...y-settings-

The thing is: My dialog does not respond at all to the resets. The light stays constant white and does not flash. It doesn't even flash when I unplug it and replug to the power outlet. I also checked my router settings, different ports and different cables. When I connect the Dialog via Ethernet to my router the light on my router indicates that there is a connection at this port but in the router's web interface the Dialog does not show up under the LAN connections. The Phantoms do show up there once they are connected with their IP address.

Did anybody have this kind of behavior or is the Dialog bricked? I am really frustrated right now because this one of hour of listening I had was quite nice