@Pip60 On second thought, it appears you have two networks configured. I wish you wouldn't hide all useful info from your screenshot. If this is the network that you want to delete, follow this...

@Pip60 Follow this document, section Reset a Deco unit: How Do I Reboot or Reset My System?

@Pip60 It will not be in "Offline clients," that list is for devices connected to Deco mesh. I powered off one of my Deco M5, named Study, this is what I see in Deco app: Do you see your unplugged...

@moakley24 WiFi6 runs on the same 5 GHz band as WiFi5. In Deco app, there is no separate WiFi6 toggle: as long as you allowed 5 GHz, both WiFi6 and WiFi5 will be available. Disable 5 GHz and both...

@Pip60 Do you see powered off (unplugged) Deco in Deco app as OFFLINE, or do you not see it in Deco app at all?

@Seyeclops You can swap Main Deco, and this is the workaround I was going to suggest if upgrade will fail. There is just one thing: you can't buy new M9 Plus in single units, only in 2-unit and...