i have D850 or D855. which model i have.

I just got used lg g3 D850 (in software details) but on identification sticker on back side it says D855... But IMEI is same in software and on sticker.

I cant see the android update option available in setting menu and its running android 4.4.2 version with build number KVT49L.D85010D.

I need to know which model i have in my hands and how to identify it.

Thanks and advance.