@Nick_CY Screenshots say everything is OK and link between two Deco units is good. Do you have device with Ethernet port you can hardwire to Main Deco and run pings from that device?

@Nick_CY Yes, this is ugly. Deco mesh can do better, especially in AP mode. To help me understand what you have, make screenshots of "Show Map" and "Show List" pages in Deco app and share them here....

@Smokes Your Satellite Deco (Sleepout) is too far fom Main Deco, it can't establish good WiFi link to Main Deco. You should move Satellite Deco closer to Main Deco. In Deco app, open Satellite Deco...

@friedeggs Connect Main Deco to Port 1 (LAN1) of BT ONT box and see if Deco can establish connection. If it does, you would not need to do anything else. If BT ONT box has just one Ethernet port,...

Sunshine wrote @blaznim_vole Hi, At present, only Deco M4 V4 has the firmware that adds the function to choose connection preference. Deco M4(V4) 1.1.0Deco M4(V4) 1.1.0. Otherwise, the only...

@RedT25 Yes, you would be able to do that. ------ In regard to your choice of Deco model. I can find at least two Deco models under AC1200: Deco E4 and Deco M4. There might be Deco M5, too. If you...