Firmware Download via USB

I have to upgrade the firmware on 25 cable boxes simultaneously.

The fastest way to perform the code download is via USB. I need to come up with a solution that will allow me to send the firmware to all boxes via USB. I have multiple test racks as well as model types that require different firmware versions. Therefore, it is not ideal to plug a flash drive into every box and upgrade the firmware because it would require a ridiculous amount of flash drives. I would like to have a centralized location to store all the different firmware and push the specific firmware I need to a rack of 25 units.

Does anyone have any suggestions?
I really appreciate the help.
Thanks,
Mark

Hello Mark,
One solution that I can suggest is using USB hub. The only problem here is that you cannot do it simultaneously for 25 units. So far based on what I know, the maximum number of ports for a USB hub are 10. Probably you can do this by batch of 3. Please see link below for a sample product online of the 10 port USB hub.

Link: http://www.ebay.com/itm/10-Port-Hi-Speed-USB-..._USB_Cables_Hubs_Adapters&hash=item19e4be4513