@eforosj Hello, thanks very much for your detailed info again. This case will be forwarded to the engineer and they will help follow it up to locate the issue. Our engineer will email you, if you are...

@Pat1185 Hello all, sorry to respond late. For those who have encountered the disconnect issue with the Deco M4 network, please help to confirm the following information and we will try to fix it...

@Andy1234 Hello all, sorry to respond late. For those who have encountered the disconnect issue with the Deco M4, please help to confirm the following information and we will try to fix it ASAP: 1....

@Lucaspty Hello, sorry to respond late. Is there any error message when adding the 4th unit in the network? A screenshot on the Deco app would be nice. How about the LED on the 4th unit when you fail...

@e3henri Hello, sorry to respond late. As mentioned in this below post, this 1.4.0 version firmware for the Deco M9 Plus can ONLY by updated via the Upgrade Tool and will not be pushed via the Deco...

@cacb @JuanDS As far as I know, there is currently no plan to add this firmware upgrade to the Deco app. But your opinions will surely go to our developer and they may evaluate the feasibility later....