Give write permissions to external memory(/mnt/extsd) on Android

On a rooted Android device, you can modify your /system/etc/permissions/platform.xml to fix the permissions issue.

On the terminal, enter:

adb pull /system/etc/permissions/platform.xml

Modify platform.xml such that media_rw is included in WRITE_EXTERNAL_STORAGE permission:

<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
  <group gid="sdcard_rw" />
  <group gid="media_rw" />
</permission>

Push your changes

adb push platform.xml /system/etc/permissions/platform.xml

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