Firmware Version 1.1.0 incorporates the following enhancements and fixes:
1. Adds an electronic full-time manual focus function (a function that enables constant manual focus adjustment in both One-shot AF and Servo AF), which is enabled when using the EOS R5, EOS R6, and EOS R3 cameras.
2. Improves an issue in which the background is not blurred when performing slow panning with the IS (Image Stabilization) mode set to Mode 2 or Mode 3.

Firmware Version 1.1.0 is for lenses with firmware versions up to Version 1.0.8. If the lens' firmware is already Version 1.1.0, it is not necessary to update the firmware.

You can check the firmware version of the lens from the camera menu. Refer to the camera instruction manual for how to check the current firmware version.

In the folder you downloaded are the firmware ( RF030110.afu / file size: 2,883,636 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 check the procedure in accordance with the instruction.