Sorry to hear that you are experiencing difficulties. Here is how I do firmware updates.
I use a dedicated SD card for firmware updates. It is only 16GB. I low level format it in the camera every time I get ready to use it. I unpack the ZIP file, and place the update file in the root directory of the SD card, not in a sub folder.
If you are getting an error when you attempt to use the EOS Utility, then that could mean you are trying to use a firmware update that is not intended for your camera. By that I mean, if you purchased your camera outside the United States, trying to use the firmware found on the Canon USA web site could likely generate the type of error you are seeing.
Every camera that Canon builds is intended for a specific market around the world. This is done for a few technical reasons that are not important. What is important is that you must use firmware that matches your camera’s “country of origin.”
Here is another example. A user in the United States may purchase a “grey market” camera because it was being sold at a discount below list price. A “grey market” camera is a camera that was not manufactured for sale in the US market. Canon USA does not service “grey market” bodies. They try to update their camera firmware from the Canon USA web site, and may get the same error that you are.
The SD card update may be reporting the same issue in a different way. It is not finding the correct firmware for the camera’s country of origin.
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