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Affected ProductCanon EOS-1D X Digital SLR Camera
FirmwareFirmware Version 1.2.1 incorporates the following improvements and fixes.
1. The function to disable the Image size selection button has been added.
* Please see the instruction manual "EOS-1D X Firmware Version 1.2.x Additional Function" (PDF file) included in the downloaded firmware 1.2.1 folder for information on how to intentionally disable this button, after the firmware update 1.2.1 has been installed in the camera.2. Fixes a phenomenon in which Err 70 and Err 80 may occur during certain shooting conditions.
Firmware Version 1.2.1 is for cameras with firmware up to Version 1.1.1. If the
camera's firmware is already Version 1.2.1, it is not necessary to update the
The firmware update takes approximately seven minutes.
Before downloading the firmware update for your camera, please review the instructions thoroughly.
The new Firmware Version 1.2.1 can
be downloaded by
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 X. By registering, we will be able to notify you via email when service updates are available.
Customer Support Operations
Canon U.S.A., Inc
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