This is from the SD1 manual, but is probably the same for VFX.
Hold down the Presets button; at the same time press the upper left soft
button (right above the flluorescent display). A message will appear: 'ERASE
MEMORY AND REINITIALIZE'. Select"yes" and it will restart itself, putting
the ROM programs in internal memory. You will have to reload the sequencer
operating system. Do you have that on disk?
Cheers
Mike Nelson
Manicmaestro@...