Is your Deco in AP mode or router mode? Mine says QoS is only available in router mode. I just use my ISP router with the AP turned off and my Decos in AP mode.

Is your Deco in AP mode or router mode? Mine says QoS is only available in router mode. I just use my ISP router with the AP turned off and my Decos in AP mode. My ISP router is pretty full-featured so I don't really care to deal with whatever simplified management the Deco would give me if it was the router and firewall instead.