Unregistered tablet - how does it know to update?

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AC Question

We are the software development department of a company that makes industrial equipment and we have some Galaxy-Tab 4 tablets that we use as "remote controls" for the manufacturing equipment, using an app we wrote ourselves for the purpose. We bought these tablets online, right out of the box from Samsung, i.e., there is no phone company or common carrier involved. These tablets are not registered with Google, i.e., there is no gmail account associated with them; in fact we can't even access Google Play with them.

So I was surprised when I came in this morning and saw a notice on the screen that a scheduled software update has been downloaded and was ready to go. It says it's 876.87 MB and it wants to do an OS upgrade to Lollipop.

Is this legit? Since this tablet isn't registered how does it even find it - and where is the upgrade coming from?
 

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