This 9.7-inch slate that arrived on the market last August gets Android 7.0 via OTA, the new firmware dropping some of the preinstalled apps in addition to the usual changes that come when moving from Marshmallow to Nougat.
https://www.notebookcheck.net/Asus-ZenPad-3S-10-gets-Android-Nougat.231922.0.html