You need downgrade your phone to kk, then root, and flash the rom you want
No.. no you can't install this on your phone. The requirements for any android device are extremely specific, this simply wont install on anything other than an LG G3. Unless its distinctly says it's for your phone, don't even attempt installing it.
<hint> http://forum.xda-developers.com/android/general/rom-classic-kat-v1-t2884689 </hint>
First off, every aspect of an android device has to be the same, including resolution and ram AND device model (the file simply will not install on anything other than an LG G3).
Second the two phones share zero similarities,
>LG G3 has Snapdragon 801 SoC
>Noir i9 has Mediatek MT6582 SoC
To be super clear, nothing you find in http://forum.xda-developers.com/lg-g3 will be compatible with your phone.
solved this but now when I flashed this CM12 i dont how to install play store.