@AnnoyedUser69 Deco mesh in AP mode will turn on its DHCP service when "primary" DHCP server on the network becomes unavailable. As long as there is functioning DHCP server on your network Deco mesh...

@AnnoyedUser69 It appears wired link between your switch and Main Deco is broken. Network layout will be the following and it explains what you see: Node 2 can't connect by Ethernet to Main Deco, so...

@Pete12121 Check this document for suggestions how to properly wire Deco mesh units: General questions about Ethernet Backhaul feature on your Deco

@Bug_Boy I've seen that type of Ethernet issue reported with laptop dock before, but can't find the link. See if this can help: In device manager all devices under USB controllers must have power...

@ekincaid Are you sure you haven't configured static IP address on Raspberry Pi itself? Deco mesh will not show devices with self-configured IP addresses. If Pi does get IP address dynamically, try...

apousa wrote @Alexandre. How can I find HW version on my device? @apousa This TP-Link FAQ document may give you an idea where to look: How to find the hardware version on a TP-Link device