@Alexandre. Yes it is the Deco M3, they were only purchase 2 years ago, so the fact that the firmware will not update to enable them to work correctly is very poor. if I stand by my bak door and in...

Connected as instructed, but the connected items ie iphone, will ony connect to main router deco, all lights are on on the 2 other decos. My set up is 3 story property, with main deco on middle...