There are two ways to upgrade your firmware (or to install an alternate firmware ;) ):
- use the UpgradeFirmware program that comes with this firmware. But this only works if your mac is a bit older an can boot natively in OS 9.0 - 9.2.
- copy the firmware to your cf-card using a card reader
So if your Mac can only boot into OS X just get a card reader. Since transferring pictures is much faster with a card reader it's a good idea to get one anyway.
NOTE: the camera initiates the firmware upgrade process only if your batteries are COMPLETELY charged!!! My batteries were about 90% charged and when the firmware update would not start i was thinking something with the transfer went wrong. So charge your batteries completely and save yourself half an hour of trouble shooting... ;)
Canon EOS Digital Rebel/EOS 300D Digital
Camera firmware
Version: 1.1.1