iOS update?

A

AC Question

ios update?

My dad has a tablet that he uses in his store, and he uses the iZettle as a metode of payment. When I came home today he said that there had been an ios (?) Update, andre that he no longer could work the iZettle. It is a Tab 5, i think. He is wondering if there is a possibillity to reset the tablet just a day back?