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Firmware Version 1.3.3 incorporates the following improvement and fix.
Firmware Version 1.3.3 is for cameras with Firmware Version 1.2.3 or earlier. If your camera's firmware is already Version 1.3.3, it is not necessary to update the firmware.
When updating the firmware of your camera, please first review the instructions thoroughly before.
EOS 5D Mark III
Once the EOS 5D Mark III camera is updated to Version 1.3.3, it cannot be restored to a previous firmware version (Versions 1.0.7 through 1.2.3).
Contact Information for Inquiries
Should you have questions about the announcement, please contact the Authorized Service Facility in your area or you may contact the Call Center within your region.