Exclamation [Q] Problem with "USB Connect " Mtk6572

I have a problem with my mobile Gt-i9190(i9500) mtk6572

can't access to my mass storage

when i try to connect usb to my mobile , it's charge my mobile but dont
access to mass storage

i try to install phone util.apk but not install

and try to use code (*#7284#) but it's not working ,

i won't help please