[LG V20 Questions & Answers] twidledee:
C:\WINDOWS\system32>fastboot getvar 100

100:

finished. total time: -0.000s

C:\WINDOWS\system32>fastboot -w

Creating filesystem with parameters:

Size: 56094621696

Block size: 4096

Blocks per group: 32768

Inodes per group: 8192

Inode size: 256

Journal blocks: 32768

Label:

Blocks: 13694976

Block groups: 418

Reserved block group size: 1024

Created filesystem with 11/3424256 inodes and 261000/13694976 blocks

target reported max download size of 536870912 bytes

Creating filesystem with parameters:

Size: 1291845632

Block size: 4096

Blocks per group: 32768

Inodes per group: 7888

Inode size: 256

Journal blocks: 4928

Label:

Blocks: 315392

Block groups: 10

Reserved block group size: 79

Created filesystem with 11/78880 inodes and 10367/315392 blocks

erasing 'userdata'...

FAILED (remote: unknown command)

finished. total time: 0.016s

C:\WINDOWS\system32>fastboot devices -l

LGH9181d51471e fastboot

C:\WINDOWS\system32>fastboot -s LGH9181d51471e

usage: fastboot [ <option> ]

C:\WINDOWS\system32>fastboot -ls

fastboot: option requires an argument -- s

C:\WINDOWS\system32>fastboot mount

usage: fastboot [ <option> ] <command>

C:\Users\twidl\Desktop\platform-tools>fastboot flash /data/media/0 twrp-3.0.2-1-h918.img

target reported max download size of 536870912 bytes

sending '/data/media/0' (24092 KB)...

OKAY [ 0.547s]

writing '/data/media/0'...

FAILED (remote: unknown command)

finished. total time: 0.562s

C:\Users\twidl\Desktop\platform-tools>fastboot flash /data twrp-3.0.2-1-h918.zip

target reported max download size of 536870912 bytes

sending '/data' (24092 KB)...

OKAY [ 0.547s]

writing '/data'...

FAILED (remote: unknown command)

finished. total time: 0.563s

C:\Users\twidl\Desktop\platform-tools>fastboot flash / twrp-3.0.2-1-h918.zip

target reported max download size of 536870912 bytes

sending '/' (24092 KB)...

OKAY [ 0.547s]

writing '/'...

FAILED (remote: unknown command)

finished. total time: 0.578s

C:\Users\twidl\Desktop\platform-tools>fastboot boot / boot.img

cannot load '/': Permission denied

C:\Users\twidl\Desktop\platform-tools>fastboot flash / boot.img

target reported max download size of 536870912 bytes

sending '/' (18932 KB)...

OKAY [ 0.438s]

writing '/'...

FAILED (remote: unknown command)

finished. total time: 0.469s

C:\Users\twidl\Desktop\platform-tools>fastboot flash /data/media/0/Pictures -p boot.img

unknown partition '/data/media/0/Pictures'

error: cannot determine image filename for '/data/media/0/Pictures'

C:\Users\twidl\Desktop\platform-tools>fastboot flash /data/media/0/Pictures -p twrp-3.0.2-1-h918.zip

unknown partition '/data/media/0/Pictures'

error: cannot determine image filename for '/data/media/0/Pictures'

C:\WINDOWS\system32>adb start-server

C:\WINDOWS\system32>adb kill-server

C:\WINDOWS\system32>adb get-state

* daemon not running. starting it now on port 5037 *

* daemon started successfully *

unknown

C:\WINDOWS\system32>adb get-serialno

unknown

C:\WINDOWS\system32>adb get-devpath

unknown

C:\WINDOWS\system32>adb remount

error: device '(null)' not found

C:\WINDOWS\system32>adb root

error: device '(null)' not found

C:\WINDOWS\system32>adb usb

error: device '(null)' not found

C:\WINDOWS\system32>adb tcpip

error: device '(null)' not found

C:\WINDOWS\system32>adb forward --list

C:\WINDOWS\system32>fastboot -b

fastboot: option requires an argument -- b

C:\WINDOWS\system32>adb -n 100

C:\WINDOWS\system32>format[:[ext4fs][:[1291845632]] boot

The filename, directory name, or volume label syntax is incorrect.

C:\WINDOWS\system32>fastboot format[:[fs32][:[1291845632]] boot

Warning: boot type is , but [fs32][ was requested for formating.

Warning: boot size is , but [1291845632]] was requested for formating.

Formatting is not supported for filesystem with type '[fs32]['.

C:\WINDOWS\system32>format[:[fs32][:[1291845632]] boot

The filename, directory name, or volume label syntax is incorrect.

C:\WINDOWS\system32>adb reboot

error: device '(null)' not found

C:\WINDOWS\system32>fastboot reboot bootloader

rebooting into bootloader...

OKAY [ 0.016s]

finished. total time: 0.016s

C:\WINDOWS\system32>adb

Android Debug Bridge version 1.0.32

Revision eac51f2bb6a8-android

C:\WINDOWS\system32>adb devices

List of devices attached

C:\WINDOWS\system32>fastboot flash lineage-14.1-20170129-UNOFFICIAL-h918.zip ANDROID_PRODUCT_OUT

error: cannot load 'ANDROID_PRODUCT_OUT'

C:\WINDOWS\system32>fastboot flash lineage-14.1-20170129-UNOFFICIAL-h918.zip $ANDROID_PRODUCT_OUT

error: cannot load '$ANDROID_PRODUCT_OUT'

C:\WINDOWS\system32