@FloSun TP-Link Archer uses OneMesh technology for WiFi mesh, which is not the same as Deco mesh. You can't make one seamless WiFi mesh from both. If you can, replace Deco P9 with TP-Link OneMesh...

@JLChip Deco M9 Plus has gigabit Ethernet ports. You will not get speeds faster than gigabit with Deco M9 Plus, even if it is connected to 10Gbps router. This is what you should expect to see for...

@sensei_ishikawa Try workaround: enable Guest Network, set it as 2.4GHz only, connect all 2.4GHz only wifi devices to Guest Network. For each of 2.4GHz stationary devices, turn off "Mesh" in Deco...

@JLChip How do you measure the speed with Deco M9 Plus and what is your Internet speed? If you use "Test Internet Speed" in Deco app, there is known issue with reporting, not with actual speed. It...

@JamesSolomon One more thing: try http://192.168.68.1/

@JamesSolomon It is possible you have older version of Deco firmware. With previous versions of Deco firmware, you may see 'Deco Health Check --> Deco is working well' when no devices are connected...