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I notice in the menus of the Canon 430EX III-RT the firmware version is shown (mine shows "Ver 1.0.1"). Is this just for diagnostic purposes? Or, is it possible to update the firmware? I can't see any obvious way for a user to update the firmware as there's no USB port. So, if it can be done, I'm assuming Canon would need to do it. Just curious.

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Generally, when there is an issue between a Canon EOS camera and a Canon flash, if possible Canon will issue an update for the camera to work around the issue. I'm not sure I've ever seen a user accessible firmware update for a Canon flash.

There have been recalls/updates that require sending a flash in to Canon to fix a bug.

This advisory regarding the firmware for certain serial number ranges of the 600EX-RT and ST-E3-RT requires shipping the unit(s) to a Canon Service Center for inspection and service. When that advisory was issued over three years ago, Brian Worley questioned why Canon does not make flashes updatable by the end user.

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