@HughCF Check your WAN port speed - it should be 1000mbps: Disable any QoS services if enabled on the router - restart the router and test again.

@IREWolfman Check this post regarding your request.

@doobre It should be like about 30 devices, both wired and wireless (in total).

@ali_ahmed Try to enable this feature from Advanced Setup mennu in Wireless settings:

@SSSK Set the Deco X20s in AP mode and try again.

@mohdkashifjamil Here's the last firmware release for Archer C9 v1. This router model is out of life from 2018 - details. Keep in mind that you'll lose the current router configuration if you update...