@Camand It depends: in my house, for example, quite long Ethernet cable connects my Main Deco to ISP router. ISP router is in the corner of the basement and I can't move it from there, Main Deco is...

@Camand Main Deco must always be connected by Ethernet cable to ISP modem/router.

@Sorin7559 Just Main Deco goes bad, right? I wonder if you have defective X60 unit, which happened to be Main Deco. To test that, promote different Deco to Main Deco and swap it with Main Deco. See...

@Floob Deco M5 is a good choice. I have two M5s (in addition to two M9s) and M5 will do just fine for your needs. In my tests, on my gigabit Internet, Main Deco M5 which is connected to Ethernet...

@Floob Yes, M4 is less capable that M9, but these capabilities that you mentioned come to light with faster Internet speeds. You can try M9, of course, I have two and like them very much, but they...

@Floob For your apartment and Internet speeds you have, I recommend you consider Deco M4: M4 = £99 https://www.amazon.co.uk/TP-Link-Deco-M4-Seamless-Replacement/dp/B07NH1J543 Deco M4 does not support...