@d0ugmac1 thanks for the quick reply! I am in Europe, but I checked the power supply, it only yields 0.5 A, that would clearly not be enough. I'll see that I get a better power supply and try again.

Hello! I have installed an EAP653 as AP for my Fritz!Box 5530 YW as the main router via a LAN cable from the basement to the 2nd floor. I just took all pre-configured settings and managed to...