• on Windows, you might need to set the file access mode in patch_odex.py to binary: odex_buff = open(odexFile, "rb").read() and patched_odex = open(outputFile, "wb") or else you will get "struct.error: unpack requires a string argument of length 4".
• if you only need the "patch" function of "patch_odex.py", you can simply remove the line "import androguard.core.bytecodes.dvm"
• files in /data/dalvik-cache/ can be changed using the dirtycow exploit: https://github.com/timwr/CVE-2016-5195
• there seems to be no need to reboot the device, just do something like this (needs android.permission.KILL_BACKGROUND_PROCESSES):

((ActivityManager) getSystemService(ACTIVITY_SERVICE)).killBackgroundProcesses("com.sec.factory");

new ProcessBuilder(dirtycow.getAbsolutePath(), patched_odex.getAbsolutePath(), 
"/data/dalvik-cache/system@[email protected]@classes.dex").start().waitFor();

((ActivityManager) getSystemService(ACTIVITY_SERVICE)).killBackgroundProcesses("com.sec.factory");

In /data/dalvik-cache, DeviceTest odex is not in system group.
what can I do ?

I run the script and get:
ImportError: No module named androguard.core.bytecodes.dvm

how could i fix this?