what is factory bios version on ideapad z580 notebook ?

hi i have a lenovo  ideapad z580 notebook . this is my laptop :

http://www.notebookcheck.net/Review-Leno...415.0.html



i am updated my bios to 5fcn95ww two years ago . I don't want this bios version. i dont know what is my previous bios version . plz help me
i want know first factory Bios version for my ideapad z580 .if you know what is my first bios version plz help me for find and download it .and in last step teach me how can i use it . it is very important for me .
first bios version plz  !!!
I am noob and new . plz help me . what i must do ? if you need any information about my laptop you can see above link !
sorry for my English .