Storage [Q] How to enable OTG usb devices on rooted L7 with stock rom?

Hello i wonder if aonybody knows how to enable OTG on LG optimus L7 p700

i have rooted the phone via framaroot and gain full rooted access

i have stock rom

i dont want to go to custom rom because i have bad expirience before with my HTC wildfire (gps not working ,automatic calls by itself etc)

so the question is if is their any way that i can enable OTG on LG optimus L7 p700 with stock rom?

i run Host diagnostic and gave my this code 300209 i wen into website and to be honest i didnt understand anynothing

*sorry for my english*