@TUMAS This is from the link I provided: In Router mode: Only the main Deco could be connected to your home modem/router. Other satellite Deco units should be connected behind the main one, just as...

@TUMAS What is your Deco mesh Operating Mode? You can that it in Deco app, under Advanced:

@TUMAS Check this TP-Link FAQ: General questions about Ethernet Backhaul feature on your Deco

@giffordg giffordg wrote I'm only getting file transfer speeds of 10MB/s......i then realised it is because E4 is only 10/100 ethernet port. Is my conclusion correct? Yes, this is correct. If I buy...

@cbrand30 Let's start with aligning expectations. In my tests with Satellite Deco M5 (which is equivalent specs to M4) the top WiFi speed I ever get on smartphone connected to it was 225 Mbps. This...

@Ed72 I wonder if you have some sort of wireless noise or interference in your house. It makes sense to return to original working configuration. Still, I would suggest you try, as a test, moving 2nd...