I have rooted two Lg, 38C Optimus dynamic. phone's with a file from Xda developers I believe. called.,'poot. apk, you. download twhis small file and another one from Google play store called ministto 2 and your phone is rooted in less than, 30 seconds.
I hope this helps you. It was a great. find for me. Now just waiting for a recovery and kernel., rom.