I have Maxis business fibre. I have switched to using Asus Rt86u router. I used the maxis supplied Aminia MA131 for Voip using Asus Lan 3 to Aminia WAN and Voip works very well. My Aminia come with 4G sim card. Now I took out the sim and inserted in 4G USB dongle and connected to USB port in Asus router and it had correctly identified

I tried to copy to 4G setting to Asus Secondary WAN using the USB but unable to get it to work if I remove the fiber connection to allow the 4G to take over.

gratefull for any guide how to set up the 4G USB dongle in Asus router RT86u