What happens when you flash a firmware on a rooted device that was not "released for it"?

I have a Samsung sm-t280 with lollipop 5 1 1 which is the highest released ota. Reason: I need nougat or marshmellow to use the sd card as extended internal storage. So the tab a 10" has an Odin firmware for it to upgrade to marshmellow. What happens when you force a firmware not released for your device when rooted? I assume it would be like putting windows 8 on a computer that says designed for windows XP. As long as the system requirements for storage and processor match should work.

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