My Wife's Note 4 Stuck On Boot Scree

My wife and I both have Note 4's. Today hers shut off by itself, and will not start up. It's just stuck on the boot screen shown in the image.
I've cleared cache, and done an FDR, but it didn't help.
I see numerous sites online talking about re-installing the stock firmware, but this is out of my comfort zone, so I'm hoping someone here can point me in the right direction.

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My Wife's Note 4 Stuck On Boot Scree

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