why you root ? none of security related app will work on root. go to service centre to unroot (be aware ..they might be say "sorry sir it needed to change your motherboard (that ofcourse not necessary)" that cost alot
you can't unroot Samsung phone as they have physical efuse which trips when rooting . so you need to change your mother board which will cost you more money
use odin to flash the official indian firmware. The mobile will become stock again(with the exception of knox related services obviously). btw, why u want to unroot? enjoy your new freedom of a rooted devuce. u may want to try custom roms and viper if u havent already. every app other than secure folder and samsung pay will work on root too(with magisk hid)
Thanks for sharing your concern. We would suggest you to visit nearby Samsung Service Centre in order to get your device issue fixed by the service engineer. Please find service centre details in the link provided -http://www.samsung.com/in/support/servicelocation
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