There are other images or folders on the SD card. Then the camera won’t be able to find the .BIN file. The SD card needs to be blank and formatted.
The SD card has been used in multiple devices and is not formatted properly.
The file name has been altered. If you download the BIN file multiple times to the same location your computer will rename the file by numbering it.
The wrong firmware file has been downloaded.
The file was corrupted during the download. If the file is corrupt, you can delete it off the SD card and try again.
The card is corrupt or has gone bad. If the SD card is corrupt you may be able to resolve the issue. by formatting the SD card. If formatting the SD card does not resolve the issue, then you will need to replace the SD card and start from the beginning.