Default [q] i cant root my lg e400....help!

HI i tried to root my lg e400 and i couldnt.I used many programs like superclick 1.7,spectrum,root tool etc, but nothing.I Also tried to change firmware but still nothing.My phone is lg e400 and firmware v10q DEC-05-2012.If you know anything how to solve my problem plz reply.

THANK YOU!!!!