@tarjona 

What may seem close is entirely different to a wireless signal as it needs to pass through different barriers.

You can use a Wi-Fi analyzer on your smartphone to see if you are getting any wireless signal from the second bedroom or see which areas would work better. You may need to move the Deco as that usually helps with the signal.

@Tony Thanks.

Actually Bedroom 1 which is wall to wall (5 feet) from the Main Deco marks only 2 out of 3 bars (semicircles). And there is only one thin wall in between.

Prior to that I had an old Apple Airport router which serviced perfectly Main Bedroom, B1 and B2. And that was old technology.

BTW I ran Test Internet Speed on the Main Deco and it marked 600Mbps and everything inside the Main Bedroom works like a charm. But when I get a thin wall in between and 5 feet it slows down radically. And Bedroom 2 (10 feet) zero bars or wifi semicircles.

I have 600Mb internet service in my house. I have 600Mb ISP service contract.

Should I switch to AP mode since I am using an ethernet backhaul. I have Ipv6 activated would that affect the coverage?

Thanks 

Temi

@tarjona 

Tony: I haven't heard from you. I would appreciate any suggestions to improve coverage.

Thanks

@tarjona 

Changing modes probably won't affect the signal, only physically moving them will.

If all the Deco units are wired then talking to each other is not an issue.

Try swapping the main Deco node to see if it is the antenna on the node. 

I strongly suggest using a Wi-Fi analyzer to see exactly what signals are going where.

@Tony Thanks.

Which Net Analyzer would you recommend?

@tarjona 

Anyone would work really.