Can I Restore Firmware?

Hi. When I was updating the firmware on my UR22C I failed.
Had to restart the computer and unplug the usb cord and try again.
Then I managed to update the firmware.
What I wonder is whether it has been updated or not?
Then I wonder what is UR-C Extension for?
Can I restore firmware to original and reinstall the new one? If it goes how do I ?
Getting a little worried when it first failed. What do you think, is that okay?