I have a backup of openwrt firmware, the backup is done via

cat /dev/mtd5 > /tmp/backup.bin

And I want to see the files in it on my linux computer without having to restore the firmware to a router. I have tried firmware mod kit https://github.com/openwrt-stuff/firmware-mod-kit and extracted the firmware with

./extract-firmware.sh backup.bin

but instead of extracting the firmware it gave me 3 files:

header.img
footer.img
rootfs.img

With the file command it gave me the following result:

How do I extract the firmware ?

Hey there.

You could just mount it somewhere.
http://madduck.net/blog/2006.10.20:loop … isk-image/

Since there's only one partition dumped and no boot sector, maybe that's what you want to do:

mount -o loop backup.bin /mnt

Regards,
Stephan.

(Last edited by golialive on 11 Jun 2017, 11:01)

I can't

me@me-VirtualBox:~$ sudo mount -o loop openwrt/firmware-mod-kit/backup.bin /mnt/openwrt/
mount: you must specify the filesystem type
me@me-VirtualBox:~$ file openwrt/firmware-mod-kit/backup.bin 
openwrt/firmware-mod-kit/backup.bin: dBase IV DBT of Wrt.DBF, blocks size 1852141647, next free block index 1, 1st item "m"
me@me-VirtualBox:~$

You would pull the filesystem out with firmware mod kit then loop-mount that file.  You may need to explicitly specify the file system type.  Check /proc/filesystems on your PC to be sure squashfs (the rootfs) and jffs2 (the overlay rootfs_data) are supported.

(Last edited by mk24 on 11 Jun 2017, 15:59)