Hmm... the webpage seemed to misfile my post...
I have a UFO 7, and I managed to burn the UFO 8.1 BIOS onto an EPROM and it works fine in my UFO system. Very little seems to be different between the 7 and 8.1 BIOS, however, except for a different splash screen and music. I plan to write the UFO 8.8c BIOS onto an EPROM someday, and see if that works on my UFO 7.