What is the different of vs01 vs02 vs04 etc

can you tell me the different of all firmware
and i have now a lite on ltr-40125s witch firm zsok
can i update to 48 speed recorder and it is yes
can you tell me witch the best is vs01 02 03 04 05 06?
thanks

gr nick

Yes you can upgrade it, at your own risk (will void the warranty). From what I have read, VS02 is the best one to go with. Get it here