You'll need make_ext2fs and rimg2sdat binaries, sdat2img.py script and python installed. rimg2sdat binaries and sdat2img.py script can be downloaded at http://forum.xda-developers.com/android/software-hacking/how-to-conver-lollipop-dat-files-to-t2978952. Make sure to use make_ext2fs from android-tools-fsutils and not from the topic, otherwise it will fail.
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