@TP-Link Nothing works. I have SonOff Basic R1 and SonOff Basic R3. Both have the same issue, can't connect to Deco X20 but no issue connecting to my older router. I know it's not the issue with...

@TP-Link I also having the same issue connecting Sonoff Basic and Deco X20 I'm on v2 hardware and latest firmware. I have also followed all the above suggestions: 1. Use Guest Wifi and set to 2.4 GHz...