If you are running a Mac then please see the following.
Answers Article: http://answers.presonus.com/27478/installed-universal-control-system-firewire-devices-showing?show=27480#a27480
If not, please log a support ticket.
You might want to ask your question in the Facebook group Presonus StudioLive Mixer Users, There are the helpful users of AI mixers. Please add some information about what update you made and which computer you are using.