@Alexandre. I tried to install Beta firmware before. Unfortunately did not work like all the other versions did not either. Thank you very much for your time and effort. I'm gonna return the M5.

@Alexandre. With the Results I get it seems like M5 does not work wirelessly.

@Alexandre. I took a Screenshot from both main Deco and M5. M5 only Shows a MAC Adresse but no IP. Analyzer App is installed

@Alexandre. Thanks for your answer. I can See M5 in the overview. SSID is "Pretty fly for a Wifi" But I do not See where to find the two GHz Bands. I activated both 2.4 and 5 GHz. The offline Decos...

@TP-Link I tried that now. When I turn off all the P7 (one of the P7 is the main Deco), I can find a Wifi named "TP-Link". So I think the wireless function of the M5 does work. When I turn on the P7...

@TP-Link Hi, thanks for your answer. I buyed it in a Shop for refurbished Hardware in eBay with 12 months warranty. The LAN Signal is working. I tried that already. I can Test the wireless Signal...