@Nik_Scho You combined two issues in one post, that causes confusion. Recommendation to send back M4 V2 is for your friend. M4 V2 is not supposed to have Connection Preference feature. That feature...

@Nik_Scho I see. For your friend, if they can return M4 V2 back to seller, that would be the easiest option. They can buy M5/M9 Plus set instead, or get WiFi6 capable X55 set. Deco X55 also supports...

@Nik_Scho For this feature to work, all Deco units in Deco mesh must support it. If feature disappeared after adding M4 V2 to Deco mesh, delete that unit from Deco mesh in Deco app and feature will...

@ezeb You can read more about WAN/LAN autosensing and topic discussion here: WAN/LAN auto-sensing I can only suggest workaround, it is up to you if you want to try it or not. Perhaps, TP-Link Support...

@ezeb For Main Deco to incorrectly auto-sense WAN/LAN port there usually must be device attached to LAN port capable of confusing Main Deco. Out of three you listed Raspberry Pi 4 is a suspect. To...

@Pedr057 Thick walls are WiFi signal killer. Does not matter what Deco model you try or what other brand of WiFi mesh. They all use same standard WiFi protocols to communicate. With WiFi, newer...