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 11.2.1 (15K152) | December 13, 2017 | 1.5 GiB | AppleTV5,3_11.2.1_15K152_Restore.ipsw | Download |