@GD91 

How have you found that one of your Satellite X50 does not broadcast on 2.4GHz? Also, it is Satellite Deco that has a problem, not Main Deco, correct?

  @Alexandre.  Broadcast is OK on the main DECO, and also on a first satellite.

My first satellite is wired to the main one.

My second satellite is wired to the first one.

On the second satellite, I have plugged a PC and it is OK.

But, I have no broadcast on 2,4 GHz !!! Only on 5GHz ....

My GSM does not show any WIFI on 2,4 Ghz ant this is confirmed with a WIFI analyser app ....

  @Alexandre. I made the test you explained, this morning : it was successful !

I made another test : I wired this second satellite to the first one with a short wire : it was successful too !

I bring this second satellite at its place (around 15 meters) and plug it (it is wired with the first satellite as it was in the previous test)

--> it was not successful : OK in 5GHz, not ok in 2,4GHz

Successful when connecting a PC via Ethernet!

I tested the wire : OK !

So, I have no idea at all ...

I'm going to exchange the two satellites ....

After having exchanged the two satellites : I still got the same issue ... in the same place !

So, the X50 are not responsible.

This issue seems more and more strange ....

Any idea ?

  @GD91 

I am out of ideas. If Satellite Deco reports 2.4GHz/5GHz link to Main Deco, it means its 2.4GHz hardware module working correctly. Why can't you find 2.4GHz from that Satellite Deco in WiFi analyzer, I would not know.

  @GD91 

Thanks for investigation and update. It is really useful and was learning experience for me. Hopefully, the rest of your experience with Deco mesh will be the smooth sailing.