How to Flash Lineage OS on an LG V20 Phone

This method will, when completed, will provide you with root and an unlocked bootloader, with fastboot available. It is a somewhat involved process, but the majority of the process has been simplified as much as possible.

WARNING!!!!This replaces your current bootloader with a debug bootloader. If you attempt to lock this bootloader you may brick your device.
Currently AT&T(H910) and Sprint(LS997) cannot return to stock because no KDZ files are available.

Disclaimer:
Once your phone is unlocked, it will no longer be covered by LG warranty @me2151.
As we cannot guarantee the proper operation of our hardware with custom software, we are not able to maintain the full scope of warranty for your device after you have unlocked the bootloader.
Because of that we have a responsibility to let you know that defects which may result from, or were caused by custom device-software may not be covered by LG warranty @me2151. Continue reading