Can't update Note 4 software after rooting phone

[gurisingh]

I've tried to root my phone a while back because I needed to use a different sim card. Now I can't update the software anymore. I keep getting: "The operating system on your device has been modified in an unauthorized way. Try downloading software updates using Samsung Kies on your PC or visit a customer service center."

Any idea how I Can fix this?

 

[belodion]

Welcome.

By first unrooting your device.

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