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 12.1.1 (16K45) | December 5, 2018 | 1.8 GiB | AppleTV5,3_12.1.1_16K45_Restore.ipsw | Download |