I stopped my tries to change the manifest of HOS for now. You can't open that easy the AndroidManifest.xml. It´s a binary xml format, so you need at least a converter in both directions, if you want to change a textline there. Next problem is the apk package format the AndroidManifest.xml is stored in. You can´t go in there and change some data. You need to decompile the APK file first, then you can make your changes and finaly recompile it back. At some point there is also the need of signing the apk. This is really to much work, for changing some few textlines to allow the app access to external storage. Android is a piece of shit.