If your StudioLive mixer's factory presets were lost after a firmware update, the board is not passing audio, not working as expected or being unresponsive; you can reset your StudioLive to its Factory Default Settings. Check out this link in our knowledge base: http://support.presonus.com/entries/21327135-how-to-do-a-factory-reset
Also if you want to keep your user created presets or scenes, you will need to back them up. Check out this link in our knowledge base: http://support.presonus.com/entries/20266186-studiolive-scene-preset-backup-transfer