Casio CZ/ VZ/ FZ - Pro Series

> What's the procedure to do a factory reset, may that would restore
> patches?
> 
 The factory reset on the VZ-8M is done by holding in the 
"write/copy/init" button while powering on the unit. This will erase 
all user presets and operation memories and set them to the internal 
ROM bank 1 settings. So back-up if you can. The reset is quick, about 
a half second, with no prompt screen asking if you really want to 
initialize settings. It should read "SYSTEM ALL INITIALIZE OK!". If 
not there may be another problem.
 Probably a near dead backup battery. There are a pain to replace as 
they are soldered onto the circuit board. I usually replace them with 
a battery clip/holder. But I have never replaced one on a VZ yet.

Terry (The Casio Kid)