EOS 5D Mark IV Firmware Version 1.3.3

Firmware changes:

Firmware Version 1.3.3 incorporates the following fixes.
1. Improves the camera’s connection compatibility to a PC while using a USB 3.0 or higher compatible cable.
2. Fixes an issue, in which self-timer shooting cannot be performed in Firmware Version 1.3.1 and 1.3.2.
3. Fixes an issue, in which an electronic beep does not sound when registering an AF frame as the AF start position in Firmware Version 1.3.1 and 1.3.2.
4. Fixes an issue, in which a small sound is generated from the speaker when the power is turned on in Firmware Version 1.3.2.

*Item 1 applies to Version 1.3.2, whereas Items 2 through 4 apply to Version 1.3.3.

The Version 1.3.3 firmware being released this time is for cameras with firmware up to Version 1.3.2. If the camera's firmware is already Version 1.3.3, it is not necessary to update the firmware. When updating the firmware of your camera, please first go over the instructions thoroughly before you download the firmware.

Preparations for the Firmware Update:
In the folder you downloaded are the firmware (file name: EOS5D400133.FIR/file size: XX,XXX,XXX bytes), and instructions on the firmware update procedures (a PDF file in five languages: Japanese, English, French, Spanish, and Simplified Chinese). Before starting the firmware update operations, please be sure to carefully confirm your understanding of these instructions.

Firmware download link:
https://www.canon.com.au/cameras/eos-5d-mark-iv/support?option=drivers