@Kevin_Z All works fine so far now when I give the C80 a IP address within the range of the main router... so in my case the main router is 192.168.1.1 and the C80 is now 192.168.1.250. Then the...

@Kevin_Z Hi there, just tried the WDS mode and it does work. However, I am now not able anymore to log in to the device via tplinkwifi.net or IP address. EDIT: Very tricky stuff here... -first setup...