Change your Merlin FlashRouter’s WiFi Network Name to different names for the 2.4GHz and 5GHz bands so they can be joined separately.
Login to Asus Merlin firmware settings in a browser on any computer or smart device.
1. Under General select Network Map.
2. In the Network name (SSID) field enter two different names for the 2.4GHz and 5GHz bands.
3. Click Apply and then rejoin the new wireless network.