Need to upgrade firmware on three hubs but don't have Windows computer.

I have a Mac with three Plugable 7-Port Aluminum USB 3.0 SuperSpeed Hub with 20W Power Adapter (VIA VL812 Rev B2 Chipset with v9081 firmware. I need to update the firmware but there is no firmware for Mac that can be installed without Windows. Has anyone figured out a way of doing this? Everyone I know has USB 2.0 Windows computers and it needs a 3.0 computer to do this.