operating system has been modified in an unauthorized way

Woodstock13

New member
Aug 27, 2016
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I have Samsung galaxy core 4.4.4 Android phone and when I hit 'software updates' I get a message telling me the operating system on my device has been modified in an unauthorized way. What can I do to get my system back to normal and be able to update? The device name of my phone says SM-S820L.
 

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