You should visit this link http://androidforums.com/threads/un...12-1-for-lg-l70-d320-d320n-d325-ms323.912225/ and read the instructions carefully. Flashing a custom rom like cm12 can be tricky and there can be no mistakes since you could brick your phone /: first you need to root your phone and unlock the bootloader. Then flash a recovery in order to whipe your system and to be able to flash the rom you want and gapps. Also i would do some research on your phone like how to root it and unlock the bootloader. You must understand what root means in order to root it and the consequences. It sounds very complicated but if you do everything right and have some patience youll get cm12 and all its features.i don't even know how to backup.. hayst it's very complicated for a beginner like me to do these complicated stuffs for getting an update to my phone lollipop