How to update the software of an unrooted device? (Error Message) My device is recently unrooted, so I decided to update the software of my Samsung Galaxy Tab 3V (SM-T116BU) but this error message (The operating system on your device is modified in  an unauthorized way...) always shows up each time I tried to update the software even though I have unrooted my device. Is there a solution for this problem?
did you try with "Smart Switch" program from your PC, and download the update from there? As I saw in the video, you have to download the program, and check the latest update for your phone when connecting via USB. You can check this video, I think you can solve your problem by this way.


  https://www.youtube.com/watch?v=BRDyAlqIrhU