Nvidia covers the 2015 Shield in Nougat
 

When we said the hardware inside the updated Nvidia Shield Android TV was "essentially unchanged," we weren't kidding. Nvidia has pushed out a software update for the original Shield that upgrades it with Android 7.0 Nougat and most (if not all) of the newer model's features. Owners of the 2015 Shield console can stream movies and shows in 4K HDR from the internet, and games from a local network in similar 4K bliss.

http://techreport.com/news/31345/nvi...ield-in-nougat