Canon 5D Mark III firmware v1.2.1 update. By gerald_wallace May 12, 2013 in Canon EOS Mount. Share As you know, the download takes several minutes and again, was 01-27-2021 06:49 AM. Hi! I'm testing EOS Webcam Utility both on PC and Mac with my beloved 5D Mark II. I find curious that it's working properly on Windows 10 but not on Mac OS Big Sur (I'm using the Catalina version, which seems to be working for other users here in the forum). Make sure you are running Canon firmware 2.1.2. Once you have the correct Canon firmware: Format the card from the camera. Unzip the archive and copy ML files to the memory card. Run the Firmware Update process from Canon menu. EByZeZ.
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  • canon 5d mark ii firmware update 2.1 3 download