Why can't I receive OTA updates?

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A

AC Question

Can't receive OTA updates.

Hi
So when I unrooted my (Galaxy S5 SM-G900F) I thought that by unrooting it using the option on superuser app it will make my phone back to a normal one but when I tried to software update it it jist says that "The O.S on your has been modified in an unauthorized way" so what should I do? And ofc my android status says "Custom" instead of official. *ADDITIONAL INFO* I have not yet tried to flash any kind of rom I only rooted so I can use some apps that needs root. kindly help
Thanks in advance