@Kevin_Z The faulty unit is not on the Deco network, so it doesn't show on the web UI. I have to add it first to the wifi network and then it will show on the tplinkdeco.net, that's the problem, I...

I bought the new Deco X60 3-unit pack, configured the main unit and both slave units easily. I noticed there was a firmware upgrade available on TP-Link's website for all three units, and began the...