What is the USB socket for on the Bridge?

A friend and I both have DS DACs and we were discussing the merits of our setups. I use a Bridge II and he uses a Bryston BDP-1. He didn’t realize my connection was an ethernet cable from my router; he thought a USB cable went from my computer to the Bridge. I explained how it works but I don’t know the purpose of the USB socket on the Bridge.

It’s for updating the firmware inside the Bridge.

Just curious, is it a different type of USB that plugs into that USB slot?

Somehow a Type A male USB cannot be inserted into my bridge USB slot.

No. A normal Type A male connector should work.