The FireStudio Mobile is a "legacy" product, which uses Universal Control v1.7.4 as the latest & greatest. The AI series of mixers use different firmware and software versions because of their different technical design. It seems to be possible to link a legacy SL board with your FireStudio Mobile, as this post says: http://answers.presonus.com/7403/can-chain-presonus-firestudio-project-with-my-studiolive-24?show=7403#q7403.