Hello, I have a problem with my current setup.

I have 5 Deco M5 as follows:

Operation Mode: Wireless Router

Internet Modem >>ethernet<<Main Deco

Main Deco >>ethernet<<Satellite 1

Satellite 1 >>ethernet<<Satellite 2 

Satellite 2 (not working signal source from ethernet) is only getting signal from another satellite wirelessly 

Satellite 3 >>wireless 

Satellite 4 >>wireless

The ethernet cable connected to Satellite 2 gets full signal using laptops or devices plugged, but my Deco doesn't recognize the signal source as ethernet, so my ethernet cable is not the problem. 
 

what can I do to fix it?