XDRDX is correct:
You would think since most firmwares reboot the device after they are installed that would be all that is needed but not so in some cases, usually when new features are added, then you need to do a full reset, factory in some cases for the CAM to make use of the new features. Even restoring a backup Config is not advised since it will not have the new features. Also, you would need to update any Client software too. If no new features are added, just security or bug fixes, a simple reboot should be fine.