@CoOlOccd Below are answers to your two questions. A1. Yes. You can make Main Deco work as a router when you rewire it the way you plan to. The following document discusses wiring of Deco units:...

ImtiazAli wrote @David-TP Is there any specific WiFi analyzer app you're referring to? @ImtiazAli I'm not David-TP, but I can recommend WiFi Analyzer. My recommendation is WiFiman app by Ubiquiti. It...

@piknew I have Deco mesh that consists of M9 Plus and M5, with M9 Plus as Main Deco. I can choose M5 as Main Deco, even if it has lesser priority in TP-Link recommendations. Still, I think your...

@harry66 Even if everything worked with Deco M5s, there is still a chance something might not work with different networking gear. It is a slim chance, but it does exist. To confirm it is not...

@Jennywise The recommended solution is to configure Deco mesh to run in Access Point mode. This will make everything run on single subnet, which should make problem go away. How to set up Deco to...

@piknew Something might be up with Deco app or TP-Link cloud. Try the following steps, in that order, and after each step check if Deco app will allow to select M4 as new Main Deco. 1. Unplug...