Canon EOS-1D X Mark II Update Manual page 3

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In case of using the card reader, follow the procedure from Step (3) onward. In case of not using the card
reader, follow the procedure from Step (4-1) onward.
(3) Copy the firmware update file to the CF card (or CFast card).
1. Insert a CF card (or CFast card) that has been formatted in the Camera into the card reader.
2. Copy the firmware update file to the first window that appears when the CF card (or CFast card) is opened (the
root directory).
*If the firmware update file is placed in subfolder of the CF card (or CFast card), the camera will not see it.
3. Remove the CF card (or CFast card) from the card reader.
*When removing the CF card(or CFast card), be sure to do so as described in the documentation for the computer or the card
reader.
4. Insert the CF card (or CFast card) with the firmware into the camera.
5. Turn the Power Switch <ON>, and then press the <MENU> button to display the menu.
6. Rotate the Main Dial and the Quick Control Dial to select the "Firmware Ver.x.x.x" item at the bottom of the
"Set-up 4(Yellow)", and then press the <SET> button.
7. The firmware update screen will appear.
Turn the Quick Control Dial, select [OK], and then press the <SET> button.
Follow the procedure from Step (5) onward.
*If the firmware update screen does not appear on LCD monitor, the firmware update file may not have been
properly copied to the CF card, so please try again starting from step (1).