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How to backup a partition

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Senior Member
Jun 24, 2012
For example:
dd if=/dev/block/platform/hi_mci.0/by-name/boot of=/sdcard/boot.img
and so on.

I have done the backup to the image file as you have suggested.
I have copied image file to the linux computer, but when I try to mount the image file I get:

mount -o loop boot_orig_B830.img /mnt/boot/
mount: /dev/loop0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or helper program, or other error

In some cases useful info is found in syslog - try
dmesg | tail or so.

What is the file system for this image?

Length of the image file is:
ls -l boot_orig_B830.img
-rw-rw-r-- 1 test test 16777216 Lis 13 22:04 boot_orig_B830.img

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