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Suppose the following situation:

End-user have a unroot phone. (the phone is not rooted).

End-user install a app, which actually is a System app and is installed in the /system of the phone.

So, does a factory reset remove these app?

(In the first place, can end-user install a system app onto a unroot phone?)

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1 Answer 1

up vote 2 down vote accepted

System apps can't be installed without root. Only updates to existing system apps can be installed, and they don't actually reside in the /system partition; the original app is kept there, which allows you to uninstall updates separately. So a factory reset will remove any updates, but not the original app.

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Can I assume that the original app that you are referring to are those apps that is already inside when it is inside the box (or before I unbox)? –  Jack Oct 30 '12 at 4:51
    
@Jack Yes indeed. –  Matthew Read Oct 30 '12 at 22:11

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