
with Root Explorer or a similar app, edit /system/etc/permissions/platform.xml
and modify or add if it's necessary:
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" > <group gid="media_rw" /> <group gid="sdcard_rw" /> </permission> <permission name="android.permission.WRITE_MEDIA_STORAGE" > <group gid="media_rw" /> <group gid="sdcard_rw" /> </permission>

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