Firmware version 1.2.1 is now available for the EOS 1D X. It incorporates the following improvements and fixes. 1. The function to disable the Image size selection button has been added. 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. The firmware can be downloaded from the Canon Download Centre
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