@conquit 

Hello,

It's OK to connect the Deco mesh network to the existing router and they are compatible. When Deco works with an existing router, it is suggested to turn off the router's Wi-Fi network and use Deco's Wi-Fi network instead to minimize the wireless interference.

However, Deco can't build a mesh network with non-Deco devices, it can only build a mesh network with the Deco devices.

Hopefully, that answers your question but let us know if you need more details.