Update: Canon has released a corrected firmware with a new number 1.1.1.1.00. This one should be good to go.

Get it here: http://www.usa.canon.com/cusa/professional/products/professional_cameras/cinema_eos_cameras

Do not install Canon C300 Firmware 1.1.0.1.00 as it has been discontinued.

There seems to be some problems, one of them causing some colour shift.

There is no way to self downgrade to the previous version yet. But your EOS service center can do it very quickly.

Its just a matter of a few minutes.

To downgrade they use a few special files and a different procedure to downgrade, as it is not possible trough the menu.

These downgrade files are not available to the public. So contact your EOS service center if you urgently need to downgrade.

My guess is a few people at Canon won’t have a weekend and they will provide a public fix very soon.

So it should not take to long until people will either be possble to downgrade with a new release, or we will see a fixed version in the next couple of days.

Here’s some Canon information sent out to some C300 users.

Service Notice: EOS C300 and C300PL Firmware Version 1.1.0.1.00 has been discontinued.

To Users of the Canon EOS C300 and C300PL Cinema EOS Cameras.

Thank you for using Canon products.

Details:

We have suspended download services for Firmware Version 1.1.0.1.00 that was posted Tuesday November 12, 2013 at 8PM EST, because it has been determined that discrepancies in color balance can occur with footage captured by the EOS C300 and EOS C300PL running Firmware Version 1.1.0.1.00.

We are currently preparing new firmware with a fix for this issue and will release it as soon as it is available.

We are very sorry for the inconvenience, but we ask for your patience during this time.

Support:

We are preparing new firmware with a fix for this issue. If you have updated your EOS C300 or EOS C300PL firmware to version 1.1.0.1.00, please contact the Canon Customer Support Center. Contact information is provided below. The Canon Customer Support Center will provide you with further details and will restore the camera’s firmware version to 1.0.9.1.00 for any EOS C300 or EOS C300PL camera running firmware version 1.1.0.1.00.

This information is for residents of the United States and Puerto Rico only.

If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.
Please register the*EOS C300 and EOS C300PL. By registering, we will be able to notify you via email when service updates are available.
If you already registered, please ensure you are opted-in to receive the notification.
Thank you,
Customer Support Operations Canon U.S.A., Inc
Canon Customer Support Center Phone: 1-855-CINE-EOS (toll free) 1-855-246-3367
TDD: 1-866-251-3752 (toll free)
For additional support options: Canon U.S.A. :