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Did you dump the full chip into one image file? If so you can't mount the individual partitions in it directly. You have to first put them into loop devices:
# kpartx -a mmcblk0.img
# mount -o loop /dev/mapper/loop0p1 /mnt
... etc
# umount /mnt
# kpartx -d mmcblk0.img
where did you put that pullup resistor ?
i have only one file not 4 of themYou have specified /dev/sdb (as opposed to /dev/sdb1, 2, 3, 4 for individual partitions), and assuming that you do end up with an ~8GB file at test.img, that will be a dump of the whole chip. (Assuming there were no errors -- look carefully at the results for this)
A full chip dump is my preferred method for getting your data. When you have this, use the above kpartx procedure to get access to the individual partitions inside the image.
If all has gone well, guard this 'Golden Image' and make backups of your backups of it.... until your next firmware upgrade when you'll pull a new Golden Image. I name my images by version and scope, such as 18.24-mmcblk0.img, 18.24-mmcblk0p3.img, etc.
And also pull partitions 3 & 4 individually and make backups to your backups -- in different places. My backups server is in the basement, well away from everything else in case of fire or theft.
Once you've changed your eMMC to an industrial-grade chip, you won't have to worry about that problem for the life of the car (or your life, whichever is shorter).
Do a 'ls' in /dev/mapperkpartx -a ( file path) i get this point very well
but this command mount /dev/mapper/loop3 /mnt gives me cant find in etc/fstab ( does it mean that it does not find any known file system )
edit: ok i forgoted sudo -i
mount /dev/mapper/loop3 /mnt i get
mount: /mnt: special device /dev/mapper/loop3 does not exist