I found a solution. If you go to the "C:\Program Files (x86)\National Instruments\NI-488.2\GPIB-ENET" folder, you will find the "FirmwareUpdate.exe" application. Double click that executable, it works just fine. I have no idea why my installation of NI-MAX didn't have that app listed in the menu. BUG in the install or user error??? I have NI-MAX on three machines and none of them have that app.