Muthukrishnang I never had the similar issue. you may check the wiring once and also see if there is any option to reset the smart switch from the app

Muthukrishnang were there any error displayed when changing the profile through the software

Muthukrishnang It may work but I haven't tried it myself. Will see, if I can treat it sometime

Muthukrishnang Nope. you don't require any zigbee hub. This can be connected directly to the Wi-Fi network

Muthukrishnang It just works like a 2 way fixed switch. However, it may also fit in your requirement as you can control it through the app. You can turn it on momentarily and can switch off

Muthukrishnang You can't control different phases. Rather, This switch can be connected as a 2 way switch setup with one physical and the other smart switch

Muthukrishnang It's just like any other 2 way physical switch setup. but here you will have 1 physical and the other smart switch connected. hence, you can control the load irrespective of the physical switches state