[LG G5 Guides, News, & Discussion] thjubeck:
By attaching a debugger to LGUP I found a couple of new commands

INFOSPRO is called 4 times which by reading is setting some sort of properties

SIGN

SIGN is called twice before anything begins to work such as the OPEN or WRTE command and the response should be something like success cmd SIGN

I think this is the missing link as after this all commands are given with 2 kilocent commands then 2 kilometr commands in that order so possibly the SIGN command is important but also the fact that the kilocent command is given twice then the 2 kilometr responses are sent but that's just speculation. Let me know what you guys think

also two other commands that were found are

OPCMCHEK

MISCWRTE

EDIT: disregard the SIGN part seems this is more important

CHCKCLER is given twice before the exec command works it seems so new command there as well

I think CHCKCLER is our missing link. Disclaimer I am on the LG G5 but it has the same issue.

Debugged application message: [00:23:187] usb speed is high speed.

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Debugged application message: [00:23:187] Not Support Fail Safe

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Debugged application message: [00:23:187] Progress sleep for 1000 9 11

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Debugged application message: [00:23:203] Set Progress 9

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Debugged application message: [00:23:703] Set Progress 10

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Debugged application message: [00:24:203] [T0000032] 43 48 43 4B 43 4C 45 52 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 8C BA 00 00 BC B7 BC B4 CHCKCLER........................

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Debugged application message: [00:24:203] [R0000032] 43 48 43 4B 43 4C 45 52 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 BC B7 BC B4 CHCKCLER........................

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Debugged application message: [00:24:203] LAF_CMD_SUB_CLER.

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Debugged application message: [00:24:203] DATA CHECK SUM ERROR device = 0 tool = 0

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Debugged application message: [00:24:203] ==============Start Direct Download 2485MB ==============

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Debugged application message: [00:24:218] umount system (/system)

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Debugged application message: [00:24:218] [T0000032] 4B 49 4C 4F 43 45 4E 54 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E3 7B 00 00 B4 B6 B3 B0 KILOCENT.................{......

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Debugged application message: [00:24:218] [R0000032] 4B 49 4C 4F 43 45 4E 54 90 A9 25 4A 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B4 B6 B3 B0 KILOCENT..%J....................

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Debugged application message: [00:24:218] [T0000048] 4B 49 4C 4F 4D 45 54 52 00 00 00 00 02 00 00 00 00 00 00 00 10 00 00 00 A3 07 00 00 B4 B6 B3 B0 KILOMETR........................

F4 7C 31 45 4C FF 58 73 0A D6 CB 7D 23 7B F0 17 .|1EL.Xs...}#{..

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Debugged application message: [00:24:218] [R0000032] 4B 49 4C 4F 4D 45 54 52 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B4 B6 B3 B0 KILOMETR........................

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Debugged application message: [00:24:218] [T0000047] 45 58 45 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0F 00 00 00 57 EC 00 00 BA A7 BA BC EXEC....................W.......

75 6D 6F 75 6E 74 20 2F 73 79 73 74 65 6D 00 umount./system.

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Debugged application message: [00:24:234] [R0000032] 45 58 45 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0F 00 00 00 00 00 00 00 BA A7 BA BC EXEC............................

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Debugged application message: [00:24:234] [T0000032] 4B 49 4C 4F 43 45 4E 54 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 E3 7B 00 00 B4 B6 B3 B0 KILOCENT.................{......

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Debugged application message: [00:24:234] [R0000032] 4B 49 4C 4F 43 45 4E 54 CA DB 0F 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B4 B6 B3 B0 KILOCENT...!....................

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Debugged application message: [00:24:234] [T0000048] 4B 49 4C 4F 4D 45 54 52 00 00 00 00 02 00 00 00 00 00 00 00 10 00 00 00 6D 6D 00 00 B4 B6 B3 B0 KILOMETR................mm......

CB 74 3A 1A 43 2F 7D F9 DF 11 42 DC 7E 09 0A 8C .t:.C/}...B.....

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Debugged application message: [00:24:234] [R0000032] 4B 49 4C 4F 4D 45 54 52 00 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 B4 B6 B3 B0 KILOMETR........................

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Debugged application message: [00:24:234] [T0000060] 45 58 45 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 1C 00 00 00 17 2E 00 00 BA A7 BA BC EXEC............................

6D 6F 75 6E 74 20 2D 6F 20 72 65 6D 6F 75 6E 74 2C 72 6F 20 2F 73 79 73 74 65 6D 00 mount.-o.remount,ro./system.

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Debugged application message: [00:24:234] [R0000032] 45 58 45 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 23 00 00 00 00 00 00 00 BA A7 BA BC EXEC................#...........

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Debugged application message: [00:24:234] /system Unmount Success.

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Debugged application message: [00:24:234] Erase Partition name : system, sector addr : 0xE886, size(sector count) : 0x120000