Thank you for using Canon products.
This firmware update (Version 184.108.40.206 00) incorporates the following improvements:
2. Supports WFT-E8.
3. Supports peripheral illumination correction when the EF24-105mm F4L IS Ⅱ USM is attached.
*1 The firmware of the lenses also need to be updated.
*2 For CN7×17 KAS S/E1, support has already been provided in Version 220.127.116.11.00 or later.
Firmware Version 18.104.22.168.00 is only for EOS C300 cameras which have Firmware Version 22.214.171.124.00 - 126.96.36.199.00 with the Dual Pixel CMOS AF Feature Upgrade applied. If your camera’s firmware is already version 188.8.131.52.00, it is not necessary to update the firmware. Once the camera is updated to the latest firmware version, it cannot be restored to a previous version.
If the EOS C300 camera does not have Dual Pixel CMOS AF Feature Upgrade applied, please download Firmware Version 184.108.40.206.00.