Moreover, make sure that the battery is fully charged and don’t use the camera’s buttons while the installation is in progress. This process isn’t intended to be destructive, but still, it’s best to save all your personal data and configurations before applying a different firmware. It is recommended that changing the camera’s firmware be performed when the new release resolves an issue that your device has been encountering, or adds a new feature (or enhances an existing one) that could prove useful for you. However, bear in mind that applying an earlier build might not always be possible. On the other hand, downgrading the camera’s firmware can recover its functionality in the unlikely event the currently installed version is faulty or the device’s performance dropped after an upgrade. Updating to a newer firmware version than the one already installed on your camera can improve the device’s overall performance and stability, resolve various issues, and add support for newly developed features or enhance existing ones.

Copy ML files on the card and run Firmware Update. Make sure you are running Canon firmware 2.0.3. Merged in generic-cfn (pull request #716) Magic Lantern is a free software add-on that runs from the SD/CF card and adds a host of new features to Canon EOS cameras that weren't included from the factory by Canon.

Canon 7d firmware 2.0.3 features