Issues flashing SM-N986U to SM-N981N firmware?

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New member
Sep 21, 2018
So the full series of events is I bought the phone from T-mobile, paid it off and unlocked it.
Moved it over to AT&T temporarily and there software/boot took over it.
Now I live in Korea full time and want to get software updates as well as remove the AT&T branding.

I thought maybe the best path forward was to flash KT's firmware for the same model phone but don't want to brick it.
Best path forward?