Thank you for using Canon products.
This firmware update (Version 18.104.22.168 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 22.214.171.124.00 or later.
Firmware Version 126.96.36.199.00 is only for EOS C300 cameras which have Firmware Version 188.8.131.52.00 - 184.108.40.206.00 with the Dual Pixel CMOS AF Feature Upgrade applied. If your camera’s firmware is already version 220.127.116.11.00, 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 18.104.22.168.00.