@Kenta49 M9 Plus firmware 1.2 is from 2019, soon to be 5 years old. It does not have Web interface. It does not accept firmware update through Deco app. You must update firmware manually to newer...

@cognis0 I am using third-party wall mount holder with one of my M9 Plus, it works just fine for more than 3 years now. It holds M9 Plus tightly in its position.

@moxii Switch Deco mesh to Access Point mode and there will be no settings in it that could impact wired link speed: Switching a Deco to Access Point (AP) Mode Also, just to cover everything, check...

@ChrisYo94 You are supposed to see WiFi analyzer app WiFiman report WiFi interference/congestion on the channel occupied by Deco mesh, because all Deco units broadcast on that channel. They do it in...

@Ed_Harte If you haven't done anything with ISP Router you had before Deco and Main Deco is connected to it, I would suggest to configure Deco mesh to run in Access Point mode: Switching a Deco to...

@Dee_Evans To add to what was said by @Wrayman This feature is called "Allow List" and is documented here: How to configure Wi-Fi Access Control on your Deco This feature is not available for Deco...