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 9.9.13.4.5 (17L562) | May 20, 2020 | 1.5 GiB | 3b70db4ec79d744fd1170adc4d6cbcc67c9dc0c4.zip |
| ✗ | HomePod (Unknown Model) | audioOS 9.9.13.4.5 (17L6562) | May 20, 2020 | 1.5 GiB | 3b70db4ec79d744fd1170adc4d6cbcc67c9dc0c4.zip |
| ✗ | HomePod | audioOS 9.9.13.4.5 (17L6562) | May 20, 2020 | 1.5 GiB | 1e6367b0f52eb6b994b09fd583dec5a5315bb874.zip |
| ✗ | HomePod | audioOS 9.9.13.4.5 (17L562) | May 20, 2020 | 1.5 GiB | 1e6367b0f52eb6b994b09fd583dec5a5315bb874.zip |