You find the firmware versions in your PreSonus account. Anything you need can be found on the download page: http://www.presonus.com/support/downloads/StudioLive-1642AI.
If you want to use FireWire, DO NOT UPDATE TO THE LATEST & GREATEST, because of a phenomenon called "FireWire lag", which makes UC Surface on a computer simply unusable. The visualization is too slow and makes any control impossible. But you can use UC 2.5.x on an iPad. Both UC versions work perfect together. Go for this:
AI Console Firmware v9194
Universal Control/UC Surface UC 1.8 (Mac/PC) 18.104.22.168751
Capture (Mac/PC) 22.214.171.124951 (can also be 126.96.36.199751)
UC Surface (iOS/Android) - 188.8.131.52951
Hope this helps. The Knowledge Base is always worth a visit...
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