@Sunshine 

Hello,

Thanks for the answer.

It is not possible to use an ethernet cable in this place.

What I find strange is that in the room next door, where I try to connect the P9 (the garage), there is a tesla that normally connects to the internet and two other rooms next to the garage (farther away from the first one with the working P7) have two IOT (SONOFF devices) that connect to the P7 satellite (this connected via ethernet).

Any suggestion?

Thanks.

  @rs2112ss Are you using the PowerLine feature of the P7?

You mentioned P9 in the discussion.  Do you have a mix of P7 and P9?

When the "oldmain" P7 is in the same room as another satellite P7, how does it connect to it (Ethernet, PowerLine, wifi)?

  @rs2112ss Did you try installing the X20 in the garage, or as the satellite closest to the garage?

You did not describe your setup, and it is perhaps optimal to install the X20 where you require the best wifi transmission.

Also, I read that, in order to use the PowerLine capability of the P7, a P7 must be the main Deco.

  @rs2112ss 

Sorry for the mistake.... I have 4 P7 and 1 X20.

I will try your suggestion.

Thanks 

  @rs2112ss 

To optimize your Deco X20 and P7 setup, ensure proper Maintenance and placement. The P7 should be within effective range of the X20, ideally not obstructed by walls. Try placing the P7 closer to the X20 to maintain a strong connection. If issues persist, updating the firmware or resetting the devices might help.