EOS 5D Mark IV has a firmware update to improve communications with EOS Utility when registering or updating lenses for the new in-camera Digital Lens Optimizer (DLO).
Firmware Version 1.0.2 incorporates the following improvement.
1. Improves communication reliability when using EOS Utility to register/update* new Digital Lens Optimizer.
Note: *Confirm that the camera firmware is Version 1.0.2 (or later).
Firmware Version 1.0.2 is for cameras with firmware Version 1.0.1. If your camera’s firmware is already Version 1.0.2, it is not necessary to update the firmware.
When updating the firmware of your camera, please review the instructions thoroughly before you update the firmware.
The firmware update takes approximately 4 minutes.
Looking for a firmware update for another camera?
Try this page where you will find links to download the latest known firmware updates for all Canon EOS cameras