@StardustOne I moved the M4 next to the door of the extension a it works better (around 1/3 of wired connection speed). Do you think a P7 or P9 could really improve this? BTW, I followed all...

Hello, I've bought 3 deco M4 for my house. They're working fine (Speed ~half of wired RJ45 speed) but, there's always a "but" I have an extension to my house wwith huge wall (Outside wall + extension...