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Firmware version 1.2.3 for EOS 5D Mark III

Firmware version 1.2.3 for the EOS 5D Mark III incorporates the following improvements and fixes.
1. Fixes a fault in which the flash may not fire depending on the timing of when the shutter button is pressed.
2. Fixes a fault in which the AF microadjustment value may change. (This was first addressed with firmware version 1.2.1, and has been further improved with firmware version 1.2.3).
3. Fixes a phenomenon in which the LCD monitor may show a line of false color along boundaries of high contrast.
4. Fixes a fault in which the histogram of a Live View image is incorrectly displayed when an HDMI cable is connected.
5. Enables the brightness of the camera's LCD monitor to be adjusted even when an HDMI cable is connected.

You can download the firmware upgrades by following the camera links from one of these pages:
Canon UK
Canon USA
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