@Alexandre. I upgraded manually the firmware. It works. Thanks for your help

@Antoine_B it seems up to date but version seems older than the one you post.

I have 3 Deco M9Plus (Living room-Principal, Kitchen, Bedroom) i added a X50 outdoor for the garden. But the Living room-Principal is very far. I tried to set up the preferred signal switched off and...

I have 3 deco M9 covering my house which work perfectly. I installed a doorbell Ring at the gate (60m far from the Deco). The system (Ring) tells me the wi-fi signal is poor. Which tp-link device...