OTA firmwares cannot be restored to. IPSW Downloads collects them for potential future use. They might also be useful if you're doing research.
| ✗ | HomePod mini | audioOS 9.9.15.4.1 (19L452) | March 31, 2022 | 1.9 GiB | ecf39a032a3d25fbc138929b501802bee36bd076.zip |
| ✗ | HomePod mini | audioOS 9.9.15.4.1 (19L6452) | March 31, 2022 | 1.9 GiB | ecf39a032a3d25fbc138929b501802bee36bd076.zip |
| ✗ | HomePod (Unknown Model) | audioOS 9.9.15.4.1 (19L452) | March 31, 2022 | 1.9 GiB | 478719d394f6de3e9a526e4bf4b44e904745d82a.zip |
| ✗ | HomePod (Unknown Model) | audioOS 9.9.15.4.1 (19L6452) | March 31, 2022 | 1.9 GiB | 478719d394f6de3e9a526e4bf4b44e904745d82a.zip |
| ✗ | HomePod | audioOS 9.9.15.4.1 (19L452) | March 31, 2022 | 1.9 GiB | 478719d394f6de3e9a526e4bf4b44e904745d82a.zip |
| ✗ | HomePod | audioOS 9.9.15.4.1 (19L6452) | March 31, 2022 | 1.9 GiB | 478719d394f6de3e9a526e4bf4b44e904745d82a.zip |