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Canon EOS 40D Guide to Digital Photography by David D. Busch

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Official Firmware

Official firmware for your 40D is given a version number that you can view by turning the power on, pressing the Menu button, and scrolling to Firmware Ver. x.x.x in the Set-up menu. As I write this, the current version is 1.0.3, shown in Figure 9.1. The first number in the string represents the major release number, while the second and third represent less significant upgrades and minor tweaks, respectively. Theoretically, a camera should have a firmware version number of 1.0.0 when it is introduced, but vendors have been known to do some minor fixes during testing and unveil a camera with a 1.0.1 firmware designation (or even 1.0.3 in the case of the 40D). If a given model is available long enough, as the EOS 20D was, it ...

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