Firmware version 1.1.0 for the Canon RF 100-500mm f4.5-7.1L IS USM incorporates the following improvement:
• Improves performance of the image stabilisation when using the electronic shutter of the EOS R3 camera during still image shooting.
Version 1.1.0 is for lenses with firmware versions up to Version 1.0.9. If the lens' firmware is already v1.1.0, it is not necessary to update the firmware. Ensure that you read the instructions supplied with the firmware download.
For more information and to download the update visit the Canon support site.