@David-TP Thanks for the feedback. I bought all the Decos in the US, but I live in Brazil. All others are working fine (three X20 and one M5). Only one M5 is not working. I've already switched with...

I bought 2 Deco M5 to complement the network in my house formed by 3 Deco X20 (today I have 3 Deco X20, 2 Deco M5 and 3 Giga Switch, only one without the ethernet cable). Since installation (10 days...