EOS C300 EOS C300 PL Firmware Update Version 1.1.2.1 00

This new firmware update (Version 1.1.2.1 00) is for cameras with firmware Version 1.1.1.1 00 or earlier.

Thank you for using Canon products.
Changes:

This firmware update (Version 1.1.2.1 00) incorporates the following improvements.

Compatibility with the Canon RC-V100 Remote Controller (expected to be available in June 2014) has been added.
Peripheral illumination correction data has been added for the [CN-E35mm T1.5 L F] EF Cinema lens and the [EF-S55-250mm f4-5.6 IS STM] EF lens.
Resolved the issue in which the EF Cinema lens’ F number was incorrectly displayed with Firmware Version 1.1.1.1.00.
Firmware Version 1.1.2.1 00 is for cameras with Firmware Versions 1.1.1.1 00 or earlier. If your camera’s firmware is already Version 1.1.2.1 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.

Further information:

Download EOS C300, EOS C300 PL Firmware Update version 1.1.2.1 00