[Q] How to use kdz firmware updater to upgrade firmware topic

hi
i have an LG Optimus G PRO F240L korean phone . I want to upgrade its firmware from STOCK 4.1.2 to STOCK kitkat 4.4 using Kdz firmware updater (lg pc suite takes foreever to download upgrade) , but there are many methods to do so , can somebody point me in the right direction to detailed steps or just tell me here . plz i need help .
I have my F240L20g_00.kdz file (1.5 gb).
Thank you