need solution for supporting otg on gionee g4

I'm using gionee g4 mobile with android 4.2 no update, and root it using framawork,no custom rom install,
and now I want to support usb otg cable,

so my friend please help me how to do,what app i need to support this phone to support otg, tell me in details.
plzzzz,,,,,,, some one help me...:confused::confused::(:crying::crying:

sorry for bad english........................