I have successfully Rooted my LG L7 II P715 with Kingo Android ROOT application. just Google it for software,
Kingo Android ROOT software just installed n plug ur cell. HTC desire C also rooted.
welcome to xda. Actually the information you are sharing is not new on this forum. There are threads which describes how to root your device (with or without unlocking bootloader). Please don't take it negatively and keep contributing...
I have rooted this phone LG L7 II duos P715 using kingo root app
just google it for kingo root app
installed kingo root app on pc and do the procedure.