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

[Seán]

So now I wonder what might be the issue? Is it because it is 2 pack instead of 3? Should I send it back / request the refund? How to prove that it is an issue with the cube itself and not my environment?

I suggest getting it exchanged with the shop that you purchased it, particularly if you bought it from Amazon or very recently.  You can mention that the Ethernet port on one cube keeps dropping out and that that you tried Ethernet cables, no need to mention about your environment  It's unlikely they will do any testing with the unit other than a visual check that it has not have impact marks, damaged leads, etc.

If you are within Ireland / UK, another option would be to keep an eye out for a used MW6 on CeX.  A single MW6 typically sells for around £15 on CeX UK.

1. In this mw6 guide I found that there is an option to split ssid 2.4ghz & 5ghz.

It also had "e-Link" menu.

Do you have these options?

I checked my Tenda App, but it doesn't have this split option in its wireless settings menu.  No e-Link option either.

2. I can't manage my mw6 in the cloud, I can't find the bind button anymore.
Did you guys still have this bind button?

With the App on my phone, the Manage section is on the main screen, i.e. I touch the '<' arrow at  the top-left and can then touch the log-in button at the bottom:

       

3. Which firmware your MW6 use?

Mine has V1.0.0.29 (5834).