None of the Root methods for the D415 aren't working topic

I recently got this phone repaired from LG and I just got it back, only problem is that I can't root this device no thanks to that recent system update used to fixed my phone. I tried towelroot that obviously didn't work, so I tried purpledrake that didn't work when the phone went to recovery All I saw was a blank black image that's it, and up top of that my Google play music app keeps silently closing out especially when I turn the screen off, can't really play too many games especially Asphalt airborne it force closes, and when I try to move my apps to the SD card most of the time it doesn't even work........ Please help with this!! Please I'm losing my mind over this man.