Canon has released firmware version 1.2.3 for the EOS 5D Mark III, which fixes four bugs (including one in which the flash may not fire when the shutter is pressed) and adds the ability to adjust LCD brightness when an HDMI cable is connected. For the full list of fixes - and a link to the update - follow the link.
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Operation using AC power supported with AC Adapter CA-PS700 and DC Coupler DR-E17. USB Power Adapter PD-E1 cannot be used to power EOS M6 Mark II, but can charge battery pack while in-camera. * By default, the camera is set for power saving. * Time when playing back a slideshow of still images.

Right-click the zip file, and then select Extract All to extract the file. In the folder you downloaded are the firmware (5D400140.FIR / file size: 31,845,024 bytes) and instructions on the firmware update procedures (a PDF file in five languages: Japanese, English, French, Spanish, and Simplified Chinese).
So I downloaded the latest version of the EOS Utility 3 from the Canon website. It all installed okay, but when I connect my Canon EOS 5D Mark IV to my laptop via a cable, it does not recognise the camera. I have tested the cable and it works with the camera and an Android laptop. However, Lightroom is installed on my Mac and I would like to 2. Install the MTP USB Device Driver. Press and hold the Windows key and press R. In the run dialogue box that opens, type devmgmt.msc and hit Enter. This will open the device manager. Alternatively, you can also press the Windows key and type Device manager to search for it. . 237 727 411 248 418 553 98 187

canon 5d mark ii firmware