Andrewdj wrote @Alexandre. i did step 1 and step 2 then how do i change/remove the selection of main deco in the apps? @Andrewdj You now have Deco mesh that should work better than before, Main Deco...

@Fabson One more thing. If your Deco app allows to configure assignment of WAN Port, please do that for X10 Ethernet port which is connected to ISP modem: https://www.tp-link.com/en/support/faq/4252/...

@Fabson I can't think of any ZTE F660 router settings which could cause this. What you have appears to be an issue between Main Deco and switch. Your switch tells you there is no link between switch...

@Fabson With Deco mesh in Router mode you can't swap Deco units (Main and Satellite) also can't connect ISP modem directly to the switch. This will not work regardless of any issue you have on your...

@Fabson Do you run your Deco mesh in its default Router mode, or have you changed it to Access Point mode? The answer will help with troubleshooting. If you are unsure, check this FAQ: How to set up...

@Jamze With Deco M5, you can use Connection Preference feature to configure where Satellite Deco should connect, overwriting its automatic algorithm. See here: How to select a preferred signal source...