I have a HTC One M9 running Android 6.0 MM - not rooted
I don't have a spare micro sdcard to put into my phone so I just tried it from the phones internal storage called 'sdcard'. Created a folder iGO_Avic within the sdcard folder and ran the installer. Appreciate its not quite what you are wanting to do. It does however work perfectly well there and saves any setting changes that I make in the app
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