The S4 is their latest model with exactly same specs as of M4 but a little shorter and a 1.5 Amp supply. This may help :...

@mark-uk1 This may help... https://www.google.co.in/amp/s/seekingtech.com/tp-link-whole-home-mesh-wi-fi-systems-deco-m4-vs-deco-s4/amp/

@Gory33 The main difference between M5 and M9 is the dedicated wireless backhaul. M9 has a dedicated wireless backhaul on 5 ghz band which help slave decos m9 to provide better speeds. However, it is...

@TonyReilly I guess the Decos are not using the least conjested channel. It is a known issue and Tp-Link is yet to address this issue. Many requests have been made to include and option to change the...

@JackCohen Some Home Automation devices running on 2.4G have problems connecting to Mesh Networks. This is what worked for me. 1. Turn off all your Decos. 2. Create a Hotspot on your mobile with the...

@Artur88Macau It won't work for v1 or v1.1 This tool was specifically designed for V2. For v1/v1.1 use the app to update. You can even download the latest firmware from the Tp-Link official website...