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The Question is: If I would install the famous App "Tincore Keymapper" as a System App... will It get the required root permissions without my Phone being Rootet or damaged? And If the answer is positive: How to Do that via Adb?

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If your phone isn't rooted, then none of the apps can get root access, regardless of whether they are installed as system app. Also, I quite doubt how you can install extra system apps without root. Rooting may require a custom recovery and may not be easily done with only ADB.

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    Exactly that (+1). But, if installed as system app, it can use permissions restricted to such (i.e. permission-levels 'system' and 'systemOrSignature') if requested. Moreover, an app doesn't get permissions automatically, it must explicitly request them via its Manifest. Same for apps that should use "root powers": no app runs with "root powers" automatically without explicitly requesting root access itself. – Izzy Apr 30 '17 at 11:43
  • @Izzy Some apps use exploits to acquire and even "conquer" root permissions. For example KingRoot steals root from SuperSU. – iBug Jul 13 '17 at 10:56
  • I could say "now you contradict yourself" – as your answer text states the opposite. But yes, using exploits (if available) a malicious app could do that. And some in fact do, then migrating themselves to system apps (to survive even a factory-reset). As far as I've heard, some even root the device without the knowledge of the user. But IMHO the question wasn't about that aspect ;) – Izzy Jul 13 '17 at 12:49

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