New answers tagged unrooting
As ProNetGuru already pointed out, Titanium Backup could indeed be used for that: root install TiBu convert app to system app (i.e. it gets installed to /system/apps uninstall TiBu unroot. Done. That app would have access up to "signatureOrSystem" protection levels then (if specified so in its Manifest). Giving it root access is something different – ...
Sorry. You cannot install your app as a system app.
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