@drlove 

Hi, normally there would only be one SSID when trying to connect mobile devices.

Would that be the network of your old routers?

May I know the number of your smart plugs, smart TV, and other devices that have 3 same Wi-Fi displayed?

Would you please help me run a simple test:

1. change the wireless name on Deco to be a totally different one.

2. then check on these devices again to see whether there would still be 3 same SSID.

--If yes, it could be highly appreciated if you could send me some screenshots about it.

Thank you.