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Release notes:
Firmware update for the Canon EOS-1D Mark II v1.2.4

What's new?

1. Fixes the phenomenon of file number errors that occurred when shooting bulb exposures.

Fixes the phenomenon of file numbers not being sequential even if the file number setting is for sequential numbers if when a CF card is replaced while the power of the camera is switched on.

2. Improves reliability in communication when using some CF cards.

Note for users of the Wireless File Transmitter WFT-E1/E1A:
The cameras' WFT-E1/E1A settings will be initialized after the firmware is updated. Please re-set them after the update.

This firmware update applies to cameras with firmware version up to 1.2.3 installed. If your camera's firmware is already version 1.2.4, it is not necessary to perform this update.
Before downloading the firmware update, please be sure to read the entire contents of this page.

Click here for Q&A's and to download the firmware update

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