The camera app check for updates when you start it. When an app update is detected, the camera app downloads the update in the background. The Updates button displays the number of available updates. A number 1 indicates that there’s an update for either the camera app or for the camera firmware. A number 2 indicates that the updates for both the camera app and the camera firmware are available.
Click the Updates button.
Click Update and restart application.
If the camera app shows that your firmware is up to date, you can also click Check for update to manually check if there's an available update.