@TP-Link I called the 24/7 help number and the person helped me sort it out - you CAN add M4s to the E4 network (despite the FAQ answer that does not include the E4 in the mix-and-match list). He...

@TP-Link Hi again, I disconnected all the Deco E4 units (powered down) and then tried to install a new network using the M4s but using the same SSID. I guess not surprisingly the mobile failed...

@TP-Link Hi again, I have now purchased a set of 3 M4 units. I would like to set them up with the same SSID and password as the E4, but cannot find an answer as to whether this is directly possible....

@David-TP Thanks very much for the quick response. As you can imagine that is not what I wanted to hear. Looking at the label under the units I see AC1200 10/100/1000 so naturally I expected them to...

@TP-Link Hi, I have just had a 300Mps up, 100Mbps down fiber link installed. I have a laptop and a PC in the same room as the fiber modem/router and one of three AC1200 Deco units as well. When I...