@Birdylaar Don't turned ON Fast Roaming again because some older devices can't connect to WiFi when Fast Roaming is ON and because of that we have to forget wifi and reconnect it again they also...

@Birdylaar Hmm so after installation is done so your devices can't roam to nearest Deco or you not able to do installation?

@Geert_VG I think your Deco is ISP customized.

@Birdylaar What's your hardware and firmware version? Kindly confirm it.

@All_stars Yes you can set both same DNS in the DHCP Server aswell.

@Alex_Mahone Have u bought both the phones within your country or from outside your country?