@Dd99 

You have such an asymmetrical download/upload speed results that make me suspect device you use for speed testing is connected through VPN. Make sure you turn off VPN on device before running speed tests.

  @Alexandre. 
thank you, but I didn't use any vpn, I'm trying to understand why the network is asymmetric at such a level.

  @Dd99 

Run the following test:

1. Power off all Satellite Deco.

2. Disconnect MOCA adapter from the second port of Main Deco.

3. Turn off 2.4GHz in Deco Main Network.

4. Stand close to Main Deco. Your iPhone should report link speed, for both download and upload, of 866Mbps. Anything less - you may be standing too far from Main Deco. How to check the associated/link speed on a wireless client

When all of the above is done, run speed test on iPhone connected to Main Deco M4 and share results.

What speeds are you getting with that setup?

  @Alexandre. 

With the main deco there is not so much of a problem, a cable comes out of the unit to the MOCA and the second MOCA with a wired connection has good internet. When you connect to the second deco, the wifi  isn't good, but through the second lan port the connection is good, only the wifi causes a problem. 
 

the pic is the speed test followed by your test

  @Dd99 

You have symmetrical speed on Main Deco now, which is good. I expected better results, at least 500Mbps, but perhaps there is a lot of WiFi interference at your place. 

So, with this test we can assume Main Deco works fine, even if with slower WiFi speeds than one would expect. 

It is now time to take closer look at Satellite Deco.

Please share the "Show List" screen from your Deco app, example:

  @Alexandre. 
 

it's in Hebrew If something is not clear :)

  @Dd99 

Hebrew is not one of five languages I can read and write on, but from screenshot I can tell that your Satellites connect through MoCA adapters: they do report Ethernet backhaul link. 

Still, MoCA adapters are suspect: your Main Deco works fine, Internet link from it is fine, so focus now is on link between Main and Satellites, and that link involves MoCA adapters.

I just recently connected two of my Satellite Deco through MoCA adapters and am very pleased with results. I use ScreenBeam (Actiontec) ECB6200S02 adapters.

Not every adapter plays nice with Deco mesh backhaul, and I also have a bit different setup from yours: my router supports MoCA and I am using that. My MoCA adapters talk to router directly. Just like yours, my Deco mesh runs in AP mode.

The next troubleshooting step would be to focus on MoCA adapters. Before we do that, please tell me if your ISP router does support MoCA (most modern cable routers do).

  @Alexandre. 

Yes, Hot is a telecommunications company and I got the router and the MOCA(3 units) from them. 

Dd99 wrote

 

Yes, Hot is a telecommunications company and I got the router and the MOCA(3 units) from them. 

  @Dd99 

IF you've got MoCA adapters from your Internet provider, their technician must have configured adapters to talk to the router, or provided manual for you to configure MoCA adapters to talk to the router.

In that case, why would you need to connect Main Deco second Ethernet port to MoCA adapter? Main Deco already connected to the router (by Ethernet cable), you run Deco mesh in AP mode which removes all restrictions on how to wire Satellite Deco. Satellite Decos can talk to Main Deco through the router:

Satellite Deco->MoCA adapter->router->Main Deco

I wonder if having MoCA adapter connected to Main Deco is the root of the problem. Disconnect MoCA adapter from Main Deco, only have Main Deco connected to the router by Ethernet cable with nothing connected to Main Deco second Ethernet port. 

Let me know what will be the result, specifically how Satellite Deco will report their connection in Deco app after that.