OTA firmwares cannot be restored to. IPSW Downloads collects them for potential future use. They might also be useful if you're doing research.
| ✗ | Apple TV 4K | tvOS 11.4 (15L6577) | May 29, 2018 | 1.4 GiB | 09e58331deac46addb2e9885f5c0e4a462aa0cdd.zip |
| ✗ | Apple TV 4K | tvOS 11.4 (15L5536c) | April 3, 2018 | 1.4 GiB | 746e91ec427ce44ea64b2f86dfe1c4595ccce963.zip |
| ✗ | Apple TV 4K | tvOS 11.4 (15L5546a) | April 17, 2018 | 1.4 GiB | 440cd7a3c745a3f08dfa451e27e5851d2d8bc817.zip |
| ✗ | Apple TV 4K | tvOS 11.4 (15L5560b) | May 1, 2018 | 1.4 GiB | 2c390d9c2d4ed893a7376373ed4c9ee54e2ee0f2.zip |
| ✗ | Apple TV 4K | tvOS 11.4 (15L5570a) | May 7, 2018 | 1.4 GiB | 80713edbed997aed436a549c889fad3a6c247555.zip |
| ✗ | Apple TV 4K | tvOS 11.4 (15L5576a) | May 14, 2018 | 1.4 GiB | d6325a4d9373c6bde2b06b2b0dda4df1c7420f77.zip |
| ✗ | Apple TV 4K | tvOS 11.4 (15L577) | May 29, 2018 | 1.4 GiB | 09e58331deac46addb2e9885f5c0e4a462aa0cdd.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L5570a) | May 7, 2018 | 1.2 GiB | 1eead5fcf73fd5042fe81c42edb324431adcc997.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L5536c) | April 3, 2018 | 1.2 GiB | 88a72635a80266475659aaf3c0942fb4d07953ed.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L5546a) | April 17, 2018 | 1.2 GiB | d87082276d0195ec9442c2be928c39a518b8e2b8.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L5560b) | May 1, 2018 | 1.2 GiB | 0a87579a9fa421e7a7fd9f09ebc901db12211feb.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L6577) | May 29, 2018 | 1.2 GiB | 29e282b27bee5b7becd33a6668b9b6a748a6bdaf.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L5576a) | May 14, 2018 | 1.2 GiB | 0325459d4535e314883f0351c73bcba1fc2cb721.zip |
| ✗ | Apple TV 4 (2015) | tvOS 11.4 (15L577) | May 29, 2018 | 1.2 GiB | 29e282b27bee5b7becd33a6668b9b6a748a6bdaf.zip |