[LG V20 Questions & Answers] dark_prince:
Alright, I uninstalled LG Bridge anyway.

Right in Step1:

D:\v20root>step1

D:\v20root>adb push dirtysanta /storage/emulated/0
832 KB/s (18760 bytes in 0.022s)

D:\v20root>adb push aboot.img /storage/emulated/0
2365 KB/s (2097152 bytes in 0.865s)

D:\v20root>adb push dirtycow /data/local/tmp
348 KB/s (9984 bytes in 0.028s)

D:\v20root>adb push my-run-as /data/local/tmp
538 KB/s (13796 bytes in 0.025s)

D:\v20root>adb shell chmod 0777 /data/local/tmp/*

D:\v20root>adb shell /data/local/tmp/dirtycow /system/bin/run-as /data/local/tmp/my-run-as
warning: new file size (13796) and file old size (14360) differ

size 14360

[*] mmap 0x772d1b6000
[*] exploit (patch)
[*] currently 0x772d1b6000=10102464c457f
[*] madvise = 0x772d1b6000 14360
[*] madvise = 0 1048576
[*] /proc/self/mem -2122317824 1048576
[*] exploited 0x772d1b6000=10101464c457f

D:\v20root>adb shell /data/local/tmp/dirtycow /system/bin/applypatch /data/local/tmp/dirtycow
warning: new file size (9984) and file old size (165144) differ

size 165144

[*] mmap 0x793c825000
[*] exploit (patch)
[*] currently 0x793c825000=10102464c457f
[*] madvise = 0x793c825000 165144
[*] madvise = 0 1048576
[*] /proc/self/mem 1367343104 1048576
[*] exploited 0x793c825000=10102464c457f

D:\v20root>adb shell
elsa:/ $ run-as con
run-as: Package 'con' is unknown
254|elsa:/ $ chmod 0777 /storage/emulated/0/*
chmod: chmod '/storage/emulated/0/Alarms' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Android' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/DCIM' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Download' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Foxit' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/LG PC Suite' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/LGBackup' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Movies' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Music' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Notifications' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Pictures' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Podcasts' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/QuickMemo+' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Quickset Setup' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/Ringtones' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/WhatsApp' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/aboot.img' to 100777: Operation not permitted
chmod: chmod '/storage/emulated/0/dirtysanta' to 100777: Operation not permitted
chmod: chmod '/storage/emulated/0/free.vpn.unblock.proxy.turbovpn_ACache' to 40777: Operation not permitted
chmod: chmod '/storage/emulated/0/pwbg.jpg' to 100777: Operation not permitted
chmod: chmod '/storage/emulated/0/theme' to 40777: Operation not permitted
1|elsa:/ $

if I type id in terminal window after, I get untrusted_app

but if I type in terminal "applypatch /system/bin/atd /storage/emulated/0/dirtysanta"

It starts to show me the usage of applypatch command instead. everything fails after this point.