Hi, John,
The 5G wifi modular is added to PCI-E port on N16 PCB circuit (refer to attached picture) not USB port.
Attached screenshot of relevant packages of this given firmware for your reference, on the welcome page, brief introduction said N16 is a concurrent 2.4 and 5GHz dual band device...
Appreciated so much for your update on this firmware.
I tried to flash this firmware on my RT-N16 which added with 5G modular and worked properly with other firmware such as dd-wrt and ASUSWRT modified version previously, on this updated firmware I could find GUI indicated with 5G, but I have...