Try unplugging everything from Quadro except the USB connector, then disconnect all USB devices (internal and external) from the computer except the mouse, the keyboard and the Quadro, then shut down the computer, turn off the power supply, remove the power plug from the power supply and press the power button on your computer 10 times.
This should completely de-energize the computer.
Reconnect the power supply, switch it on and start the computer.
Now the firmware update should work.
After that you can connect everything again.
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