It seems the long ongoing chip supply issues might have convinced Canon to build their…
Changes in the Firmware. Firmware Version 1.0.4 incorporates the following fixes and improvements:
1. Fixes a phenomenon in which a red-colored area may appear at the bottom-center of a captured image when shooting in bulb mode or during a long exposure.
2. Fixes a phenomenon in which the autofocus may not respond when the autofocus is initiated via pressing the shutter button, the AF-ON button or the AE lock button when configured in the custom control menu.
3. Enhances the reliability of communications between the camera and SD card.
4. Fixes incorrect wording on the Finnish language menu screen.
Firmware Version 1.0.4 is for cameras with firmware Version 1.0.3 or earlier. If your camera’s firmware is already Version 1.0.4, it is not necessary to update the firmware.
When updating the firmware of your camera, please review the instructions thoroughly before you update the firmware.
The firmware update takes approximately 4 minutes.