[Samsung Gear S3] adfree:
Tested on my Z1... seems no big difference between stock Firmware and Combination Firmware... in case of content of Boot1 and Boot0...

Here example for dumping partitions... or "whole" eMMC...

Limitations...

We know Gear have no external SD card... so Full dump on same eMMC :D :rolleyes:

My example is set to 512 MB... for study this should be big enough...

dd if=/dev/mmcblk0boot0 of=/opt/usr/media/Others/boot0.bin

dd if=/dev/mmcblk0boot1 of=/opt/usr/media/Others/boot1.bin

dd if=/dev/mmcblk0rpmb of=/opt/usr/media/Others/mmcblk0rpmb.bin

dd if=/dev/mmcblk0 bs=512 count=1000000 of=/opt/usr/media/Others/d1.bin

Files are stored then in Others folder...

Should be look something like this... and only possible if ROOT...

sh-3.2# dd if=/dev/mmcblk0boot0 of=/opt/usr/media/Others/boot0.bin
8192+0 records in
8192+0 records out
4194304 bytes ([B]4.2 MB[/B]) copied, 0.214274 s, 19.6 MB/s

sh-3.2# dd if=/dev/mmcblk0boot1 of=/opt/usr/media/Others/boot1.bin
8192+0 records in
8192+0 records out
4194304 bytes ([B]4.2 MB[/B]) copied, 0.222438 s, 18.9 MB/s

sh-3.2# dd if=/dev/mmcblk0rpmb of=/opt/usr/media/Others/mmcblk0rpmb.bin
1024+0 records in
1024+0 records out
524288 bytes ([B]524 kB[/B]) copied, 0.0265871 s, 19.7 MB/s

sh-3.2# dd if=/dev/mmcblk0 bs=512 count=1000000 of=/opt/usr/media/Others/d1.bin
1000000+0 records in
1000000+0 records out
512000000 bytes ([B]512 MB[/B]) copied, 95.7674 s, 5.3 MB/s

Best Regards

Edit 1.

Maybe also interesting to see... these 2 Commands:

df -h
lsblk

Sorry, example again from Z1 Mobile with SD Card inside... :o

sh-3.2# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 879M 365M 502M 43% /
/dev/root 879M 365M 502M 43% /
devtmpfs 349M 0 349M 0% /dev
/dev/mmcblk0p22 110M 36M 72M 34% /opt
tmpfs 357M 24K 357M 1% /dev/shm
tmpfs 357M 1.4M 356M 1% /run
tmpfs 357M 0 357M 0% /sys/fs/cgroup
tmpfs 357M 28K 357M 1% /tmp
/dev/loop0 4.7M 4.7M 0 100% /usr/share/locale
/dev/mmcblk0p21 27M 36K 26M 1% /opt/system/csc
/dev/mmcblk0p9 6.8M 72K 6.2M 2% /csa
/dev/mmcblk0p23 2.5G 525M 2.0G 21% /opt/usr
/dev/mmcblk1p1 3.7G 1.4G 2.4G 36% /opt/storage/sdcard
sh-3.2# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 4.6M 1 loop /usr/share/locale
zram0 254:0 0 142.7M 0 disk
mmcblk0rpmb 179:96 0 512K 0 disk
mmcblk0boot0 179:32 0 4M 1 disk
mmcblk0boot1 179:64 0 4M 1 disk
mmcblk0 179:0 0 3.7G 0 disk
|-mmcblk0p1 179:1 0 1M 0 part
|-mmcblk0p2 179:2 0 1M 0 part
|-mmcblk0p3 179:3 0 1M 0 part
|-mmcblk0p4 179:4 0 1M 0 part
|-mmcblk0p5 179:5 0 1M 0 part
|-mmcblk0p6 179:6 0 1M 0 part
|-mmcblk0p7 179:7 0 1M 0 part
|-mmcblk0p8 179:8 0 1M 0 part
|-mmcblk0p9 179:9 0 8M 0 part /csa
|-mmcblk0p10 179:10 0 9M 0 part
|-mmcblk0p11 179:11 0 2M 0 part
|-mmcblk0p12 179:12 0 2M 0 part
|-mmcblk0p13 179:13 0 2M 0 part
|-mmcblk0p14 179:14 0 8M 0 part
|-mmcblk0p15 179:15 0 8M 0 part
|-mmcblk0p16 179:16 0 8M 0 part
|-mmcblk0p17 179:17 0 8M 0 part
|-mmcblk0p18 179:18 0 8M 0 part
|-mmcblk0p19 179:19 0 4M 0 part
|-mmcblk0p20 179:20 0 2M 0 part
|-mmcblk0p21 179:21 0 32M 0 part /opt/system/csc
|-mmcblk0p22 179:22 0 128M 0 part /opt
|-mmcblk0p23 179:23 0 2.5G 0 part /opt/usr
`-mmcblk0p24 179:24 0 896M 0 part /
mmcblk1 179:128 0 7.4G 0 disk
`-mmcblk1p1 179:129 0 3.7G 0 part /opt/storage/sdcard