Signed IPSW files can be restored via Finder, the Apple Devices app, iTunes, or idevicerestore. Unsigned IPSWs cannot currently be restored to.
| ✗ | Apple TV 4 (2015) | tvOS 10.2.1 (14W585a) | May 15, 2017 | 1.3 GiB | AppleTV5,3_10.2.1_14W585a_Restore.ipsw | Download |