How to set up Tenda Nova mesh for wired backhaul - MW5, MW6, etc.

[bart]

Hey everyone, I need help connecting my set of two MW6 nodes via cable. I followed instructions from a thread I found, but none of the methods provided lasting results. My setup is straightforward, I want to connect the devices in series as follows:

ISP Router -> Primary Node -> Secondary Node -> Switch -> PC/Laptop/other, while also ensuring wireless access along the way.

• WiFi on my router is disabled.
  
• The 1st Node shows an "Excellent" wired backhaul.
  
• Despite being connected via cable and far enough away that WiFi signals are weak, the 2nd Node keeps defaulting to wireless backhaul.
  

At one point, I managed to briefly establish a wired connection for the second node, but it soon switched back to WiFi automatically. The cables are fine—when connected directly to the router or primary node, I achieve gigabit speeds.

I’m out of ideas and would greatly appreciate any help, thank you.