@MsLady Deco units can work either in router mode or in AP mode - here's the difference. AP mode typical scenario is described here. Here's how to use Deco with your existing router.

@vncz Go through this FAQ to see why when mixing different Deco units in one network.

@drat242 I see that in your initial post you mentioned a FW release for HW v1.60 - 1.2.8 Build 20230901 Rel. 36505 Looking at the support portal I see a pretty new FW release - Deco...

@BroncoCountry No, I've meant that if you even clone the Arris MAC address to your main Deco unit that may not fix your issue. But that shouldn't stop you from doing this - clone the Arris MAC and...

@FromVT Try this solution and check if it helps in your case.

@BroncoCountry You can clone the Arris TM822G modem MAC to your main Deco but that may not be the real problem. What make and model is your unmanaged switch ? There are known issues when using D-Link...