Mobile Firmware and Knowledge: Android Huawei firmware extractor

place you system.img(this is a ext4 file system extracted from huawei firmware, repacking of this file needs only linux to work) and the 2 binaries in one directory, and make sure the binaries have exec permission.

Part 1 – mount the filesystem

Please call new terminal from accessory of start menu then type

$ mkdir sys(creating new directory named sys in home)

$ ./simg2img system.img sys.raw(drag and drop simg2img to linux terminal then system.img after that type sys.raw ,then please wait for a while it will create sys.raw ,which you will see black color in ubuntu home )

If your ubuntu needs root access ,you can make root easily see below

$ sudo passwd root(type like this in terminal ,when asking for password ,type your current password ,then it will ask you to create new unix password ,ok type one and retype one ,so now you will see the text updated successfully,so now you have root access in ubuntu)

$ sudo mount -t ext4 -o loop sys.raw sys/

If you want to modify the content it is better that before you change the permissions, copy to a new dir and unmount the loop device:

$ sudo chmod -R o+r sys

$ cp -R sys/ sys_MOD/

$ sudo umount sys

Then you have all your files in the folder sys_MOD/ and you can modify whatever you want.After that, if you want to flash your new partition via recovery, you just need to zip the folder with an installer script written in edify code.If you want to flash it using fastboot you firstly need to pack your folder in a new image.

Part 2 – create a new flashable image

sudo ./make_ext4fs -s -l 900M -a system sys_MOD.img sys_MOD/ 670m to get 672.1 m

sudo ./make_ext4fs -s -l 1020M -a system sys_MOD.img sys_MOD/ 672.1m this is correct size for g610 huawei system.img

change the partition size by watching original firmware size of system or also see via adb shell cat /proc/partitions

if you type partitions size lower than original size ,you will get following error

Creating filesystem with parameters:

    Size: 536870912(512M)

    Block size: 4096

    Blocks per group: 32768

    Inodes per group: 8192

    Inode size: 256

    Journal blocks: 2048

    Label:

    Blocks: 131072

    Block groups: 4

    Reserved block group size: 31

error: do_inode_allocate_extents: Failed to allocate 134 blocks

if you type match or larger partition size ,you will get and create like below message

Creating filesystem with parameters:

Size: 734003200 (700M)

Block size: 4096

Blocks per group: 32768

Inodes per group: 7472

Inode size: 256

Journal blocks: 2800

Label:

Blocks: 179200

Block groups: 6

Reserved block group size: 47

Created filesystem with 1455/44832 inodes and 173178/179200 blocks

Now you can simply type:

# fastboot flash [PARTITION_LABEL] FILENAME_MOD.img

[HELP]how to repack system.img on 4.1.1ßsee

[REF][I9500-I9505] How to repack galaxy S4 img files (system/cache) ßsee

I9500 System repack code(easy remember code-sl ma system o od, sl ma cache o od)where s=-s,l=-l,m=512M,a=-a,system or cache,o=output,od=original directory

Type1(su), Type2(make_ext4fs -s -l 2764M -a system /sdcard/system.img /system)

Cache Code: Type1(su), Type2(make_ext4fs -s -l 2072M -a cache /sdcard/cache.img /cache)

I9505 System repack Code: Type1(su), Type2(make_ext4fs -s -l 2760M -a system /sdcard/system.img.ext4 /system)

Cache Code: Type1(su), Type2(make_ext4fs -s -l 2070M -a cache /sdcard/cache.img.ext4 /cache)

Now you can flash in odin by making tar from this modified img and the rest of the firmware.

The commands to create tar file, for example to I9500. (Cygwin or Linux)

Code:

tar -c boot.img cache.img hidden.img modem.bin recovery.img system.img >> file_name.tar

md5sum -t file_name.tar >> file_name.tar

mv file_name.tar file_name.tar.md5

[REF] Unpacking and repacking stock rom .img filesßsee

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