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 12.3 (16M6153) | May 13, 2019 | 1.6 GiB | 6a8ed6a4b86c341e04c5e2a2e781839a8421896e.zip |
| ✗ | Apple TV 4K | tvOS 12.3 (16M5117f) | March 27, 2019 | 1.6 GiB | c3129f7ff3778834adc98ec70597da195c9cee88.zip |
| ✗ | Apple TV 4K | tvOS 12.3 (16M5129d) | April 8, 2019 | 1.6 GiB | 9a61a3035ab9d199690c50522462cb0d3b4bdb21.zip |
| ✗ | Apple TV 4K | tvOS 12.3 (16M5139a) | April 22, 2019 | 1.6 GiB | 11f1845b6a981e648694a29094d800e440188819.zip |
| ✗ | Apple TV 4K | tvOS 12.3 (16M5146a) | April 29, 2019 | 1.6 GiB | 24ee4e2a023108a85b1e9dfafede70d69c09fa3c.zip |
| ✗ | Apple TV 4K | tvOS 12.3 (16M5151a) | May 7, 2019 | 1.6 GiB | 2e6fddd57dfe313368220dd43d705a931c25d51e.zip |
| ✗ | Apple TV 4K | tvOS 12.3 (16M153) | May 13, 2019 | 1.6 GiB | 6a8ed6a4b86c341e04c5e2a2e781839a8421896e.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M5146a) | April 29, 2019 | 1.4 GiB | 118af9a482c0cf7a8f6a83e1355762fc34056c07.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M5117f) | March 27, 2019 | 1.4 GiB | d53e640c54c3bcb7381e466c28fb64450746ff2f.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M5129d) | April 8, 2019 | 1.4 GiB | 3ef6ec703639923814a8e9854c4430a1e69132eb.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M5139a) | April 22, 2019 | 1.4 GiB | c90fcde83dfce75b1b05df4da32be1f3ecef3ee1.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M6153) | May 13, 2019 | 1.4 GiB | 2e137e39de7a3de4baf9e238079e08d0653fbc6c.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M5151a) | May 7, 2019 | 1.4 GiB | bbc57c0057de72140640429d10fd3f0af7d0aed0.zip |
| ✗ | Apple TV 4 (2015) | tvOS 12.3 (16M153) | May 13, 2019 | 1.4 GiB | 2e137e39de7a3de4baf9e238079e08d0653fbc6c.zip |