@AlexDeco2023 

 

I am assuming you tried to follow this document and without success: How to add an additional unit to your Deco network

 

Quick search for M4 revealed that they are not sold in single units, but only in 2-unit and 3-unit set. That makes me believe you've got previously owned M4. If this is the case, it is possible previous owner didn't properly remove that M4 from their Deco mesh. When Deco unit is removed from Deco mesh, it'll be factory reset and ready to add.

 

You should try factory reset that M4 and see if it helps: 

 

Have the unit powered on
Hold the reset pinhole at the bottom for 1s with a paperclip or other sharp object to perform a hardware reset.
Wait untill the LED turns to blinking blue and you could begin to set it up again on the Deco APP.

  @Alexandre. 

they are also sold separately factory new.

Unfortunately in the app there is no option "add a Deco to your network", but only the configuration as a primary Deco connected to the modem, which I already have.

it's an app problem, I think.

 

  @AlexDeco2023 

 

Are you sure you are not creating new Deco network instead of adding unit to an existent one?

 

Check this document, it might help: Fail to setup the Satellite Deco

I'm pretty sure the app forces me to create a new Deco network. There is no option to add a Deco. This is the problem, indeed.

  @Alexandre. 

 

There is no support here?

  @ImtiazAli 

No it's not.

 

I think the screens posted It's the old version from the playstore. The new app has no "+".

 

 

This is actually the app without "+".