@DevonAlex The easiest would be to add Deco M9 Plus as Satellite Deco to your Deco mesh, then promote it to Main Deco. See Changing the Main Unit for your Mesh Network

@Dirkster1 If you have access to Deco app that is managing your Deco mesh, follow this document to promote one of Satellite Deco to Main Deco: Changing the Main Unit for your Mesh Network

@storeyboy10 Deco E4 has 100 Mbps Ethernet ports, not gigabit. This is what limits speeds on your home network.

richaardvark wrote Alexandre. wrote @Curiosity898 Deco E4 is the only exception: any other Deco model with Ethernet ports is gigabit or better. @Alexandre. Not entirely true. The W2400 is also a Deco...

@AndrasN Glad it worked for you. This is the only time you needed to follow that process: since firmware 1.5.* the button "Update Deco" is working in Deco app. When TP-Link releases next firmware for...

@MatteoArlo Would you consider switching Deco mesh to Access Point mode? That should eliminate this issue. How to set up Deco to work in Access Point mode If you take that route, remove Main Deco...