I used to be able to connect my C100 to a usb and download all my footage. Now it the C100 isn't recognized. I tried several usb ports and cords but no luck. The cables work fine with other devices. What do you think may be the issue? Thank you in advance.

Sounds like you might have damaged the USB port on the C100. You'll need to send the camera body in for repair.

If you upgraded to firmware version 2.0.9.1.00, then USB will not work as you expect. When connecting to a computer, you need to click the Index button, only then the connection will be established

Sounds like you might have damaged the USB port on the C100. You'll need to send the camera body in for repair.

This is exactly why it is a dumb idea to use a $2000 camera as a card reader. Not to mention the hours you are putting on the meter unnecessarily that will affect its resell value. And the camera is probably slower than a dedicated card reader, too. The camera should be used as a card reader for emergencies only. Buy a SD card reader for $10 and leave the camera in the bag.