Casio CZ/ VZ/ FZ - Pro Series

Hi all. I'm trying to transmit some Sysex libraries for the first 
time to my VZ-10M and I can't find the right way to do it. 

I've tried several Sysex programs (SysEx1.0, ChangeIt!, and even 
VZPATCH which gives me errors on WinME, therefore I haven't been 
able to effectively use it), without success. 

The VZ is configured to receive on channel 1, excluse parameter is 
enabled, and I manually set it to receive MIDI VOICE/OP. I'm using a 
MOTU MicroExpress to merge all my MIDI setup and I've been always 
able to control the VZ from a Roland JV-90 that I use as my master 
keyboard. 

I'm able to transmit the memory content to the PC successfully, as 
it indicates so, but it is a different situation when I try to 
upload from the PC back to the VZ. Anyone has any clue on how to 
sort it out? I've noticed every program uses a different MIDI config 
on regards to block size, etc. but I'm not quite sure what it means. 

Gus.