To update lolipop From kitkat

Brand Lg
Model g2(802)
Android version 4.4.2
baseband version M8974A-AAAANAZM-1.0.190082
Kernel version 3.4.0
Build number KOT49I.D80220b
Software version D80220b
plz help me. how can i upgrade it. and give me the link of necessary softwere or
tools link and the process of upgrade.