I could be wrong, however, I believe that the VZ series predates 'firmware' upgrading. At least in the modern sense. It's likely that what you have is what you get, and what came installed from the factory.
Back in the 80';s, if a machine WAS capable of having its 'firmware' upgraded, it would most likely be done by swapping out a chip/ eprom with the later o/s installed on it. Back then, many synths could only communicate MIDI and SYSEX/ CC information via a computer. Flashing a new firmware was very uncommon for a synth as old as the VZ.
Does anyone know what the most up to date firmware is for the VZ-8M?Also, does anyone know how to check the installed version on the unit itself? I guess there's some combination of buttons you need to hold down but unsure what that might be...Thanks for any help.