@Synfalle This should work, unless the switch you use does not support Deco Ethernet backaul protocols. More about Deco Ethernet backhaul is here: General questions about Ethernet Backhaul feature on...

@BottleTiger Try it diffrently: add X55 as Satellite Deco. After that, promote Satellite X55 to Main Deco.

@GaborN On any device connected to Deco mesh, open web site www.whatismyip.com and it will tell you how Internet sees your location. Change Deco mesh to Access Point mode, and the problem should go...

@Sivin It is possible something is wrong with Ethernet cables. It is also possible your ISP Router does not support Deco Ethernet backhaul. Very rare case, but happens. Also, if your ISP Router...

@PK1212 It is impossible. You should return that Deco unit to seller for refund.

@Synfalle This will not work, because Deco X50-PoE does not support EasyMesh. See TP-Link Deco Mesh vs EasyMesh vs OneMesh vs Omada Mesh What's the Difference?