An XDA user published a flashable rom containing the Android 5.0 Lollipop for international LG G3 devices (D855). However, you’ll need to have root access and the custom recovery TWRP installed.
Flash Android 5.0 Lollipop to your LG G3 – Step by Step Guide
If your device is not able to write to the internal SD, make sure to perform the following query with adb or terminal emulator: su restorecon -v -R /data/media That’s it. Enjoy Lollipop on your LG G3 and don’t forget to thank Skin1980 for his great work on XDA.