@Matt-G Have you found out how this happened? Is it the Deco or was it something else?

Yup, also going to send back the Deco and warn others for this stupid security design flaw. Some links around security problems: https://blog.keane.space/tp-link-deco-m5-hardware-hacking.html...

@Kevin_Z Sorry, I'm not happy with your answer. Such forced access means that I have to fully trust TP-link, while I had to accept all kinds of conditions I did not have time to read (and else I...