Came across this method of rooting G6 which different from the 872H method I have seen here, the one where you have to yank the USB cable. Does this work? Can anyone confirm if this has worked for them?
https://www.stupdroid.com/2017/04/root-twrp-lg-g6-h872.html
https://www.stupdroid.com/2017/04/root-twrp-lg-g6-h872.html