From Canon:
Details:
Firmware Version 1.4.0 incorporates the following improvements and fixes:
Notes:
As a result of this fix, cameras with Firmware Version 1.3.9 (or later) will not be able to read the “camera settings file” created with cameras running Firmware Version 1.3.5 (or earlier). If you require the “camera settings file”, please create it after updating to firmware version 1.3.9 (or later).
Support:
Canon USA will perform this firmware update on the EOS-1D C Cinema EOS Camera free of charge. Shipping and handling charges may apply. Please contact the Canon Customer Support Center for details.
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-1D C. By registering, we will be able to notify you via email when future firmware updates become available for download. If you already registered, please ensure you are opted-in to receive the notification.
B&H carries the Canon EOS-1D C Cinema Camera.