Thank you for posting!
First, please make sure you have downloaded and extracted the firmware. The firmware can be downloaded from the Canon USA website below:
You can update the firmware in your camera by connecting your camera to your computer and using EOS Utility. Please follow these steps:
NOTE: Please ensure the battery is fully charged before installing the update. The camera must not power off during the update.
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Canon site has rejected my Serial number for some reason. So:
Download the firmware the unzip the .fir file
Format a CF card in your camera
Remove the CF card then connect it to your computer
Copy the .fir to the root of the CF card
Eject the CF card from your computer
MAKE SURE THE CAMERA BATTERY IS WELL CHARGED!!
Insert the CF card in the camera and power on
Go to the Spanner ... (3rd and bottom option is Firmware ver. n.n.n)
Put the camera down on a surface
Scroll down to this and press the SET button on camera
It should now see the new firmware file and offer upgrade
Follow the menu and let it run through to completion undisturbed
You can look but not touch
On completion, you can reformat the CF card to remove the new firmware file.
The job's a good 'un.