Casio CZ/ VZ/ FZ - Pro Series

Hey gang, I just bought a MINT CZ-1 for $150! I'm psyched, as I love 
the CZ, and I plan to use this as a master controller too.  I have a 
question regarding sysex dumps. How do I go about loading new sysex 
data files into the CZ-1? Here's the setup so far: MIDI ON/OFF is 
lit, In the MIDI mode, I'm on Poly, ch=01, kbch=01, prg=ena. Under 
CARTRIDGE/MIDI, when I scroll to "LOAD MIDI DATA (Y/N)?" and push 
YES, I get "MIDI DISABLE", which doesn't seem right. I don't have the 
docs for the CZ-1, so if anyone can walk me through.

I'm planning on using a generic MIDI sysex util like MIDIOX. Thanks!

Dave