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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Canon released a number of firmware updates in March 2024, as follows: EOS R3 – version 1.7.1 1. Enables servo zooming to be remotely controlled from EOS Utility or Camera Connect when Power Zoom Adapter PZ-E2/PZ-E2B is attached to a compatible lens. 2. Enables up to 2 TB to be used on CFexpress cards larger than 2 TB. 3. Fixes an issue that may cause the camera, in rare instances, to stop functioning when using GPS. 4. Fixes an issue that may display Error Code 70 when performing anti-flicker shooting at a shutter speed of 1 second or higher. 5. Enhances security for FTPS (File Transfer Protocol Security) connections. 6. Fixes an issue in which Mobile File Transfer may not function when connecting the camera to an iPhone compatible with USB 3.0 and higher. 7. Fixes an issue that, under specific circumstances, may prevent the image from being displayed in the viewfinder or on the screen causing the camera to stop operating, or Error Code 70 may be displayed. 8. Fixes minor issues. EOS

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