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Constellation

Galaxy S9+ won't update to pie

I have an ATT Galaxy S9+ that is still on Android 8. The model is SM-G965U, the baseband version is G965USQU1ARB7. The last security patch was February 1, 2018.

It was purchased new in the US, I have it unlocked, and am now in South Korea using it on KT service. I have tried factory reset and Samsung smart switch to get the update but it says that software is up to date. Is there a way to manually install this new software? Please,I need help.