I have received a reply from consumer care (after mailing the problem) which helped me to diagnose the problem to a compatibility problem with my primary switch. Dear Adriaan, Thank you very much for...

I've bought the set of 3 Deco M5 yesterday - with the intention to use ethernet backhaul (my home has a lot of concrete between 3 floors and I've got ethernet cables to each). After setup of the Deco...