I guess your bootloader is still locked. run b2capp to restore OS (click override update problems if it doesn't want to update automatically). then root it, install terminal emulator, type su, then reboot oem-unlock, press volume up when prompted, then you can install any roms you want.

Sent from my LG-P760 using XDA premium app

Check out my music (hip-hop, electronic beats and remixes):
http://www.youtube.com/user/LilProphetMusic
www.reverbnation.com/lilprophetmusic