If you can tell me what you are seeing, or what type of CF card you're using, I can help you with more specific troubleshooting! Tutorial using a Canon 5D Mark II
For users in the United States, the official download page is often: https://www.usa.canon.com/support/p/eos-5d-mark-ii Always re-verify that the page’s URL contains canon.com . canon 5d mark ii firmware update 213 download updated