First check what version of firmware your camera is running.
This information is found within one of your camera’s menu options.
After the camera has been released to the public, people may find that there are bugs or problems with the way the camera operates.
The manufacturer investigates these problems and produces fixes for them in the form of firmware updates.
Firmware updates aren’t always necessary – some cameras never have updates.
When a new camera is assembled the manufacturer loads the firmware that was designed at that time.
Once again time to check Canon has released a new version of DPP (V3.5.1) that amongst other things now supports the EF 24mm f/1.4L II USM.Finding it is different on every camera and not always obvious.Your instruction manual will help you find where to look in the menus.Some of these fixes can be minor, but some of them fix more serious issues such as autofocus problems, battery-draining issues, or the camera unexpectedly locking up.Other reasons why firmware updates are released is to include new camera features such as added languages, or to have manually adjustable settings that were once solely automatic.