help - how to find phone version 3gs

[muthuin2005]

hi to all any one help me.

i am using 3gs phone how find firmwere version

only one code is working *#06# it is showing imei number.

any other code is working in my phone plz give me how to find firmwere version & softer plz

my phone back side mfu m98w writen plz help me plz