Lenovo S60 official ROM

hi friends

anybody have Lenovo S60 official stock ROM 5.0.2 ??/
and please describe the working procedure for software updating





i tried to install 5.0 lollipop by sdfuse mode, but getting an error "invalid signature "

the file i got from http://firmwarefile.com/lenovo-s60-a

the 4.4 kitkat is working


any solution ??





















regards

BR