@Giddorah Just a suggestion: what if you power off both managed switches, so that you only have two unmanaged switches up. After that: 1. Will Secondary Deco still use Ethernet backhaul? 2. Will...

@Jim27 Well, as I said, you are out of luck with software Connection Preference feature, with what Decos you have. If it is possible, you could try Ethernet cable or Ethernet over coaxial (over TV...

@Jim27 Unfortunately, not one of your Deco X20 supports Connection Preference feature. They have different firmware versions, because they came with different hardware version. I am guessing, you...

@Jim27 Connection Preference feature will become visible in Deco app only when all Deco units in Deco mesh support it. You have X50 and X20s, it appears either one of these models or both do not...

@ITV2024 Correct. Also, this is how you do that (in case you haven't found it already): Switching a Deco to Access Point (AP) Mode

@ITV2024 Start with this TP-Link FAQ: General questions about Ethernet Backhaul feature on your Deco