It could be the Nougat 7.1.1 software update unless you already have it installed on your tablet. Mine just update from Marshmallow 6.0.1 to Nougat a few days ago.
it's is in fact the nougat 7.1.1 just update my mother in law's with it it's a big jump from 6.0.1 and to be honest not happy as I have the tab s3 and it's still running 7.0