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 4 (2015) | tvOS 9.2.1 (13Y6772) | May 16, 2016 | 816 MiB | 5ff1e79b86e8e5d626e2df93eb5da7586b0932f9.zip |
| ✗ | Apple TV 4 (2015) | tvOS 9.2.1 (13Y772) | May 3, 2016 | 816 MiB | 1c0bd8fafb102182769436891f7e2e4ed2401b72.zip |
| ✗ | Apple TV 4 (2015) | tvOS 9.2.1 (13Y768) | April 27, 2016 | 816 MiB | 0c256cd9abeeffe04c57ee7b48a4c0dadc86e034.zip |
| ✗ | Apple TV 4 (2015) | tvOS 9.2.1 (13Y763c) | April 21, 2016 | 816 MiB | 996ef62987c883a97f875035c986d9074e32602f.zip |
| ✗ | Apple TV 4 (2015) | tvOS 9.2.1 (13Y5752a) | April 6, 2016 | 816 MiB | 1e9069bef79ee17ad74f5ec3836b1a5914f63413.zip |