@MDA400 Thanks I'll contact them. I think they're obligated if they are false advertising two different devices with the same name that cause problems together. Plenty of people complained about it.

@MDA400 I see, that doesn't sound good at all. I suspect this is why I am having problems. Seems misleading that TP-Link would name these the same thing, even though they have different hardware, and...

3 Deco S4 units have firmeware version 1.4.1 Build 20230324 Rel. 50892 1 Deco S4 unit has firmware version 1.6.2 Build 20240718 Rel. 69205 When I go to System > Update it gives me a run down of the 3...