I set my Canon XC10 v1.0.1.0 to update to firmware version 1.0.3.0 last night, it's still stuck on the "updating firmware" screen 9 hours later. Anyone else experienced this?

Yowza. Hate to say it Steve but I think you'll want to contact Canon Support first thing tomorrow (Monday) morning.

1-800-652-2666

https://www.usa.canon.com/internet/portal/us/home/support/details/camcorders/professional/xc10/xc10