how to unsquashfs or mount a firmware image?
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Bcm63xx firmware images has a special format like squashfs-lzma. i got some tools to extract firmware images named bcm tools (brfwmod.exe). It has a command named lzma-unsquash. i successfully unaquash it with theese tools.
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kursat almost 2 years
i want to extract my routers firmware, and modify it. so i used bitsum's firmware mod kit. it seems there is no error. i can get image_parts directory also there is rootfs.img (squashfs image) file. but the problem is i can neither mount it nor unsquashfs.
This is extraction output:
# ./extract-ng.sh AirTies_Air5021RU_FW_1.2.0.16_FullImage.bin Firmware Mod Kit (extract-ng) 0.69 beta, (c)2011 Craig Heffner, Jeremy Collake http://www.bitsum.com Scanning firmware... DECIMAL HEX DESCRIPTION ------------------------------------------------------------------------------------------------------- 65228 0xFECC Squashfs filesystem, big endian, version 2.0, size: 1369418 bytes, 382 inodes, blocksize: 65536 bytes, created: Tue May 3 13:44:22 2011 Extracting 65228 bytes of header image at offset 0 Extracting squashfs file system at offset 65228 Extracting 160 byte footer from offset 1972107 Extracting squashfs files... Firmware extraction successful! Firmware parts can be found in 'fmk/*'Mount attempt output:
fmk# ls image_parts logs rootfs fmk# cd image_parts/ fmk/image_parts# ls footer.img header.img rootfs.img fmk/image_parts# file rootfs.img rootfs.img: Squashfs filesystem, big endian, version 2.0, 1369418 bytes, 382 inodes, blocksize: 65536 bytes, created: Tue May 3 13:44:22 2011 fmk/image_parts# mount rootfs.img /mnt/rootfs/ -o loop -t squashfs 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 fmk/image_parts# dmesg | tail -n 1 [24799.284066] SQUASHFS error: Can't find a SQUASHFS superblock on loop0unsquashfs attempt output:
fmk/image_parts# unsquashfs rootfs.img Reading a different endian SQUASHFS filesystem on rootfs.img Parallel unsquashfs: Using 1 processor 336 inodes (377 blocks) to write [=============================| ] 99/377 26% gzip uncompress failed with error code -3 Failed to write squashfs-root/lib/libqueue.so, skipping [=============================| ] 100/377 26% gzip uncompress failed with error code -3 gzip uncompress failed with error code -3 gzip uncompress failed with error code -3 ... Failed to write squashfs-root/lib/modules/2.6.8.1/extra/blaa_dd.ko, skipping [====================================| ] 123/377 32% gzip uncompress failed with error code -3 gzip uncompress failed with error code -3 ... Failed to write squashfs-root/webs/management/ui_password.html, skipping [========================================================| ] 191/377 50% gzip uncompress failed with error code -3 Failed to write squashfs-root/webs/index.html, skipping [========================================================| ] 192/377 50% gzip uncompress failed with error code -3 ... Failed to write squashfs-root/usr/sbin/brctl, skipping [===============================================================================================================|] 377/377 100% created 188 files created 46 directories created 52 symlinks created 95 devices created 1 fifosi searched "error code -3", it is Z_DATA_ERROR ( data is corrupted or incomplete ). now what should i do?
thanks