Sm-n910k os

Is there a website that has the Korean operating system for the galaxy note 4 that has a fast download speed? I've tried to find one but all I come up with is sites that want you to pay for premium to get a decent speed download. Or is it possible to use an American models' OS without problems? I deleted my OS while trying to modify it and now to get the Korean version says its gona take about 7-8+ hrs to download

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