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 | audioOS 9.9.13.4.6 (17L6570) | June 1, 2020 | 1.5 GiB | 442f0b01b96bad011e85b41bade4d03a9c03920e.zip |
| ✗ | HomePod | audioOS 9.9.13.4.6 (17L570) | June 1, 2020 | 1.5 GiB | 442f0b01b96bad011e85b41bade4d03a9c03920e.zip |
| ✗ | HomePod (Unknown Model) | audioOS 9.9.13.4.6 (17L6570) | June 1, 2020 | 1.5 GiB | 5503af6a2fe5f02200dbfb38824b86908b615a09.zip |
| ✗ | HomePod (Unknown Model) | audioOS 9.9.13.4.6 (17L570) | June 1, 2020 | 1.5 GiB | 5503af6a2fe5f02200dbfb38824b86908b615a09.zip |