While Canon no longer publishes detailed release notes for legacy products, the official change log for firmware 1.0.4 (and the equivalent 1.0.5 for some regions) includes:
file) to the root directory of the CF card. Insert the card into the camera and follow the on-screen prompts in the "Firmware" menu item to initiate the update. Canon Knowledge Base Legacy and Longevity Canon 350d Firmware Update 1.0.4 Download
For photographers who prefer to print directly from the camera, the update resolved communication errors between the 350D and specific PictBridge-compatible printers. It ensured a seamless transfer of data, preventing print jobs from hanging or canceling unexpectedly. While Canon no longer publishes detailed release notes
If your screen shows (or higher, such as 1.0.5), you are up to date. If you see 1.0.2, 1.0.3, or earlier, you should proceed with the update. It ensured a seamless transfer of data, preventing
This process requires a fully charged battery and a CompactFlash (CF) card. Do not attempt the update with low battery—interrupting the process can brick your camera.
Some regional variants of the 350D (such as the Japanese Kiss Digital N) received firmware 1.0.5, which is functionally identical. The North American and European models use 1.0.4.