Lenovo s890 -Only Charging ,not showing usb storage when connecting through usb cable

Hello XDA Team,
I am KgFrank.. I have lenovo s890 phone which is not showing usb storage or option ..only charging when i connect the phone through usb cable.So that i could not root this phone..and This phone recovery is in Chinese language also.Please help me to solve this problem.I have tried installing Lenovo driver but no help for me.