Does Dynalink Router support Amazon Fire TV dongle on 5GHz?

Yes, Dynalink Router can work with Amazon Fire TV dongle on 5GHz WiFi.

However, based on some discussion on Internet, it seems the Amazon Fire TV dongle does not work on full 5GHz channels but only works on channel 36~48. In Dynalink Router’s default Auto Channel mode, Dynalink Router might select a channel outside channel 36~48 and it will not work. So if you encounter 5GHz WiFi connection issue with Amazon Fire TV dongle, please manually set the 5GHz WiFi channel to 36~48 via WebGUI. You can check below Nintendo Switch example on how to manual select WiFi channel.