Hi BEBOP,
You can download Ver. 3.1 and the manual`s at the following link:> http://www.yamaha.com/ycaservice/group019/fgrop019.htm
Be sure to "download" the new Manual as it has important info also make sure you get the right "sequence" of disk`s. You`ll need (i think) 5 floppies to do the up-grade. Just follow the instructions and you`ll be OK , Remember if you do get an "error" you can always reinstall the old ver. and try again. Best of luck , if I can help further feel free to contact me
jedi