If I install the famous App "Tincore Key Mapper" as a system app, will it get the required root permissions without my phone being rooted or damaged? If the answer is positive: How to do that via ADB?
The system apps do not have root access, but they have a lot of access. Maybe you can install Magisk Manager like a system app and gain "something like root". Installing system apps can't be done by adb, unless the phone is already rooted.
Theoretically, you intercept the phone's WiFi traffic (Bettercap) while it is updating a normal system app like Camera (update from the Settings.) Then you can modify the
camera.apk file of the fly and put the
This won't work on every device because most of the phones check if the app is signed by the manufacturer.