Recover Files from dd image of mmcblk0p12

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http://forum.xda-developers.com – Hi i accidently deleted all of my images from the internal SD-Card. I have a rooted Galaxy S3 and booted in recovery and did a: adb shell dd if=/dev/block/mmcblk0p12 > int_sdcard.dd Now i have a 12 GB int_sdcard.dd file. But i tried with Ubuntu Live CD to mount or use testdisk on it but it doesnt work. when i try to mount it says group descriptors corrupted and testdisk doesnt find any partitions on it. Please could you help me to recover my images. Thankss (HowTos)