Need help analyzing a boot.img

[licht77]

Hi there!
Currently I am trying to extract and modify a boot.img from my car stereo (to set ro.secure=0 in default.prop - its a AV7) from MIC. ( http://www.shop.mic-deutschland.de/shop/article_W005/AV7.html?shop_param=cid=6&aid=W005& )


I did my exercises by studying the specs of a normal boot.img and learned that there should be a 2k header, followed by the gzipped kernel. I should be able to identify the kernel starting after those 2k of header and ending with some zeros finished with 1F 8B. The rest should be the ramdisk, gzipped and cpioed.
So far the theory - but apparently, I am not able to extract the kernel. I also tried some different scripts floating around - none of them ended up with an extractable kernel.

Example:
/unpackbootimg -i ../boot.img -o .
BOARD_KERNEL_CMDLINE
BOARD_KERNEL_BASE e3e0ff00
BOARD_PAGE_SIZE 1768697202
-> Kernel size 0, pretty everything ends up in the ramdisk which is NOT a gzip file.

This is the boot.img: http://ul.to/ivggomon

So you see me pretty clueless at the moment - any suggestion is highly appreciated!

 

[licht77]

Noone any idea?

 

[licht77]

unmkbootimg output:

unmkbootimg version 1.2 - Mikael Q Kuisma <[email protected]>
File ../boot.img not a plain boot image, seeking for embedded image ... not found.

boot_info (from bootimg_Toolset):
.

/boot_info ../boot.img 
Android Magic not found in ../boot.img. Giving up.

 

[licht77]

The hread may be deleted. It was a uImage multi file with a gzipped cpio in it...