[LG V20 Questions & Answers] twidledee:
I'll wait for confirmation.... I need to format those

system, cache, userdata. What's the format

C:\Users\twidl\Desktop\platform-tools>fastboot devices

LGH9181d51471e fastboot

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

target reported max download size of 536870912 bytes

sending 'recovery' (24092 KB)...

OKAY [ 0.543s]

writing 'recovery'...

FAILED (remote: unknown command)

finished. total time: 0.574s

C:\Users\twidl\Desktop\platform-tools>fastboot erase recovery

erasing 'recovery'...

FAILED (remote: unknown command)

finished. total time: 0.031s

C:\Users\twidl\Desktop\platform-tools>fastboot erase system

******** Did you mean to fastboot format this ext4 partition?

erasing 'system'...

FAILED (remote: unknown command)

finished. total time: 0.016s

C:\Users\twidl\Desktop\platform-tools>fastboot erase cache

******** Did you mean to fastboot format this ext4 partition?

erasing 'cache'...

FAILED (remote: unknown command)

finished. total time: 0.016s

C:\Users\twidl\Desktop\platform-tools>fastboot erase userdata

******** Did you mean to fastboot format this ext4 partition?

erasing 'userdata'...

FAILED (remote: unknown command)

finished. total time: 0.016s

C:\Users\twidl\Desktop\platform-tools>fastboot erase misc

erasing 'misc'...

FAILED (remote: unknown command)

finished. total time: 0.031s

C:\Users\twidl\Desktop\platform-tools>fastboot erase fota

erasing 'fota'...

FAILED (remote: unknown command)

finished. total time: 0.031s

C:\Users\twidl\Desktop\platform-tools>fastboot erase boot

erasing 'boot'...

FAILED (remote: unknown command)

finished. total time: 0.031s

Went to format

C:\Users\twidl\Desktop\platform-tools> fastboot format system

Creating filesystem with parameters:

Size: 5863636992

Block size: 4096

Blocks per group: 32768

Inodes per group: 8144

Inode size: 256

Journal blocks: 22368

Label:

Blocks: 1431552

Block groups: 44

Reserved block group size: 351

Created filesystem with 11/358336 inodes and 47679/1431552 blocks

target reported max download size of 536870912 bytes

erasing 'system'...

FAILED (remote: unknown command)

finished. total time: 0.000s

C:\Users\twidl\Desktop\platform-tools>fastboot format cache

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

target reported max download size of 536870912 bytes

erasing 'cache'...

FAILED (remote: unknown command)

finished. total time: -0.000s

C:\Users\twidl\Desktop\platform-tools>fastboot format userdata

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

erasing 'userdata'...

FAILED (remote: unknown command)

finished. total time: 0.016s

On standby