drphilgandini Offline Upload & Sell: Off
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You're talking the new firmware for the 1D X? The earlier firmware was 1.2.1, and according to the Canon site, 1.2.4 includes all the 1.2.1 upgrades, so you should be able to load it on your camera. Just check when you get to the upgrade menu what the existing firmware version is, and what it plans to upgrade it to. That is clearly shown before you click OK.
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