You can find the latest firmware for your phone on this link: http://csmg.lgmobile.com:9002/csmg/b2c/client/auth_model_check2.jsp?esn=IMEI where IMEI is your IMEI.... So for example if your IMEI is 123456789 the link will be http://csmg.lgmobile.com:9002/csmg/b2c/client/auth_model_check2.jsp?esn=123456789 . The page will contain a link to your .kdz, if it's d8022 it's KitKat, if it's d8023 it's lollipop.
stuffek