[LG G4c Questions & Answers] dominik-p:
Interesting...

In Send_Command.exe please check:

1. if you can "ls" /data/media/0

It should ouput the files of internal storage ("sdcard")

Maybe LG changed the mountpoint of the internal storage...

2. type "dd if=/dev/block/mmcblk0 bs=1 count=10"

It should output some spaces, so that the "#" isn't at most left in the terminal.

(Otherwise you have no access or the mountpoint changed)

3. if you are "su", type "id"

It should output a line that contains uid=0

Did everything work as described?

Accoring to your cat output it seems that p37 is the system parition.

You can get the internal name with ("adb shell"):

(examples from the G4 H815 (International))

shell@p1:/ $ ls -l /dev/block/bootdevice/
ls -l /dev/block/bootdevice
lrwxrwxrwx root root 2015-01-25 01:10 bootdevice -> /dev/block/platform/f9824900.sdhci

You can get the partition names with the following command in "adb shell":

shell@p1:/ $ ls -l /dev/block/bootdevice/by-name

On the G4 H815 (International) it outputs this:

ls -l /dev/block/platform/bootdevice/by-name
lrwxrwxrwx root root 2015-01-25 01:10 DDR -> /dev/block/mmcblk0p30
lrwxrwxrwx root root 2015-01-25 01:10 aboot -> /dev/block/mmcblk0p8
lrwxrwxrwx root root 2015-01-25 01:10 abootbak -> /dev/block/mmcblk0p14
lrwxrwxrwx root root 2015-01-25 01:10 apdp -> /dev/block/mmcblk0p18
lrwxrwxrwx root root 2015-01-25 01:10 boot -> /dev/block/mmcblk0p38
lrwxrwxrwx root root 2015-01-25 01:10 cache -> /dev/block/mmcblk0p49
lrwxrwxrwx root root 2015-01-25 01:10 cust -> /dev/block/mmcblk0p48
lrwxrwxrwx root root 2015-01-25 01:10 devinfo -> /dev/block/mmcblk0p17
lrwxrwxrwx root root 2015-01-25 01:10 dpo -> /dev/block/mmcblk0p20
lrwxrwxrwx root root 2015-01-25 01:10 drm -> /dev/block/mmcblk0p40
lrwxrwxrwx root root 2015-01-25 01:10 eksst -> /dev/block/mmcblk0p33
lrwxrwxrwx root root 2015-01-25 01:10 encrypt -> /dev/block/mmcblk0p32
lrwxrwxrwx root root 2015-01-25 01:10 factory -> /dev/block/mmcblk0p43
lrwxrwxrwx root root 2015-01-25 01:10 fota -> /dev/block/mmcblk0p44
lrwxrwxrwx root root 2015-01-25 01:10 fsc -> /dev/block/mmcblk0p27
lrwxrwxrwx root root 2015-01-25 01:10 fsg -> /dev/block/mmcblk0p26
lrwxrwxrwx root root 2015-01-25 01:10 grow -> /dev/block/mmcblk0p51
lrwxrwxrwx root root 2015-01-25 01:10 hyp -> /dev/block/mmcblk0p6
lrwxrwxrwx root root 2015-01-25 01:10 hypbak -> /dev/block/mmcblk0p12
lrwxrwxrwx root root 2015-01-25 01:10 keystore -> /dev/block/mmcblk0p29
lrwxrwxrwx root root 2015-01-25 01:10 laf -> /dev/block/mmcblk0p37
lrwxrwxrwx root root 2015-01-25 01:10 limits -> /dev/block/mmcblk0p16
lrwxrwxrwx root root 2015-01-25 01:10 misc -> /dev/block/mmcblk0p22
lrwxrwxrwx root root 2015-01-25 01:10 modem -> /dev/block/mmcblk0p1
lrwxrwxrwx root root 2015-01-25 01:10 modemst1 -> /dev/block/mmcblk0p24
lrwxrwxrwx root root 2015-01-25 01:10 modemst2 -> /dev/block/mmcblk0p25
lrwxrwxrwx root root 2015-01-25 01:10 mpt -> /dev/block/mmcblk0p42
lrwxrwxrwx root root 2015-01-25 01:10 msadp -> /dev/block/mmcblk0p19
lrwxrwxrwx root root 2015-01-25 01:10 persist -> /dev/block/mmcblk0p23
lrwxrwxrwx root root 2015-01-25 01:10 persistent -> /dev/block/mmcblk0p35
lrwxrwxrwx root root 2015-01-25 01:10 pmic -> /dev/block/mmcblk0p2
lrwxrwxrwx root root 2015-01-25 01:10 pmicbak -> /dev/block/mmcblk0p10
lrwxrwxrwx root root 2015-01-25 01:10 raw_resources -> /dev/block/mmcblk0p45
lrwxrwxrwx root root 2015-01-25 01:10 raw_resourcesbak -> /dev/block/mmcblk0p46
lrwxrwxrwx root root 2015-01-25 01:10 rct -> /dev/block/mmcblk0p34
lrwxrwxrwx root root 2015-01-25 01:10 recovery -> /dev/block/mmcblk0p39
lrwxrwxrwx root root 2015-01-25 01:10 rpm -> /dev/block/mmcblk0p7
lrwxrwxrwx root root 2015-01-25 01:10 rpmbak -> /dev/block/mmcblk0p13
lrwxrwxrwx root root 2015-01-25 01:10 sbl1 -> /dev/block/mmcblk0p3
lrwxrwxrwx root root 2015-01-25 01:10 sbl1bak -> /dev/block/mmcblk0p9
lrwxrwxrwx root root 2015-01-25 01:10 sdi -> /dev/block/mmcblk0p5
lrwxrwxrwx root root 2015-01-25 01:10 sdibak -> /dev/block/mmcblk0p15
lrwxrwxrwx root root 2015-01-25 01:10 sec -> /dev/block/mmcblk0p31
lrwxrwxrwx root root 2015-01-25 01:10 sns -> /dev/block/mmcblk0p41
lrwxrwxrwx root root 2015-01-25 01:10 spare1 -> /dev/block/mmcblk0p21
lrwxrwxrwx root root 2015-01-25 01:10 spare2 -> /dev/block/mmcblk0p36
lrwxrwxrwx root root 2015-01-25 01:10 ssd -> /dev/block/mmcblk0p28
lrwxrwxrwx root root 2015-01-25 01:10 system -> /dev/block/mmcblk0p47
lrwxrwxrwx root root 2015-01-25 01:10 tz -> /dev/block/mmcblk0p4
lrwxrwxrwx root root 2015-01-25 01:10 tzbak -> /dev/block/mmcblk0p11
lrwxrwxrwx root root 2015-01-25 01:10 userdata -> /dev/block/mmcblk0p50

You see it is p47 on the H815.

With "adb shell" and "su" I can "dd" an image from /dev/block/mmcblk0p47, but it doesn't work with Send_Command.exe.

For some reason I need the mmcblk0 (and the right parameters) in sendcommand tool.

Please post your ("adb shell") outputs of

ls -l /dev/block/bootdevice/

and

ls -l /dev/block/bootdevice/by-name

I think it is interesting for many other users.