Although these instructions did not work for me. Maybe these instructions will help someone else. Tech support sent me them. I will most likely have to send my 192 in for repair.
1. Power off the Studio 192.
2. Whilst holding down the '48V' and 'Cue' buttons, power on the Studio 192 (this will boot the Studio 192 into Load mode).
3. Open the Universal Control application and try to force the firmware update again.
Should this still not resolve the firmware issue, please try connecting the Studio 192 to your computer using a USB 2.0 cable and then repeat the above steps.