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Old 11-11-2012, 08:09 AM   #1
Registered: Mar 2012
Location: Shenzhen Chian
Posts: 73

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Unhappy How to extract userdata.img

Hello friends,

I would like to extract userdata.img which is one of the firmware files complied under Android platform.

You can see what I have tried below:

benjamin@benjamin-virtual-machine:/GPL/tmp/userdata$ file userdata.img 
userdata.img: VMS Alpha executable
benjamin@benjamin-virtual-machine:/GPL/tmp/userdata$ /GPL/unyaffs-master/unyaffs userdata.img 
Can't determine flash layout, perhaps not a yaffs2 image
as for this situation, how to deal with it? Are there any other methods?

Any reply will be appreciated.
Old 11-11-2012, 01:12 PM   #2
Registered: Jul 2006
Location: USA
Distribution: Debian, Arch, FreeBSD, Android
Posts: 911
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Is this from a nandroid backup? If so, download the 3 files from here >

./unyaffs userdata.img
If it works, you should see "end of image" when it's done. Keep in mine it will extract the contents into the current directory.

Last edited by replica9000; 11-11-2012 at 01:58 PM.
Old 11-11-2012, 09:16 PM   #3
Registered: Mar 2012
Location: Shenzhen Chian
Posts: 73

Original Poster
Rep: Reputation: Disabled
Hello replica9000,

Thank you for your advice, and I have tried it, unfortunately, it did't work:

root@gpl-vm:/GPL/userdata# /GPL/googleunyaffs/unyaffs userdata.img 
broken image file
Did you see the code in the original post? I have tried to use unyaffs to extract this userdata.img, it is downloaded from
What't the difference between those two unyaffs.


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