I'm trying to connect my Decos X75 as access points all using the Ethernet backhaul. Decos are connected to the router and access point mode is on. But they are not connecting together via Ethernet, wifi connection between them is overriding the Ethernet connection. 

How can I solve this? I thought that they would automatically connect via the Ethernet connection and this would drive the backhaul.

I have reset the overall system and decos many times but it goes back to wifi backhaul.

Thanks

Diego