The latest firmware update to version 1.19 for the EOS 1DC must be performed by a Canon Factory Service center. In the USA please call:
1-855-CINE-EOS (toll free)
1-855-246-3367
This factory update includes the following enhancements:
Sound Recording With Line Input
Peripheral Lens Correction Available on Select Cinema Lenses
Chromatic Abberation Correction Available on Select Cinema Lenses