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 (Unknown Model) | audioOS 9.9.13.2 (17B84) | October 28, 2019 | 1.7 GiB | 1d09c2bdd26ffffa426a38ad00952b391ab6c386.zip |
| ✗ | HomePod (Unknown Model) | audioOS 9.9.13.2 (17B6084) | October 28, 2019 | 1.7 GiB | 1d09c2bdd26ffffa426a38ad00952b391ab6c386.zip |
| ✗ | HomePod | audioOS 9.9.13.2 (17B84) | October 28, 2019 | 1.7 GiB | 89866d6c5ea8b7e02714548f3aefc6915472414c.zip |
| ✗ | HomePod | audioOS 9.9.13.2 (17B6084) | October 28, 2019 | 1.7 GiB | 89866d6c5ea8b7e02714548f3aefc6915472414c.zip |