Did you get your problem resolved? Not 100% sure about your HD500, but on my Pod HD Pro X, the USB firmware shows 0.00 UNTIL I connect to the unit with either Line 6 Central app or Pod HD Pro X Edit. It then shows v1.04, which is the last version for my unit.
BTW, I just got a new Win 11 laptop. I went to the Line 6 download area, downloaded and installed the latest/last Pod HD Pro X Edit w/USB drivers, and everything works perfectly.