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 Watch Series 4 (44mm, LTE) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.4 GiB | f34a3503fb7d2d6710c1dc6ddfd9da133dd78bac.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.4 GiB | 889cb0f31521331da5e2d5fe21e3a5ce5efae0d3.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | 49c96deb525ea2384836e0733335b0239fabd18f.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | a2758f834979f19d02579890284de9967cf361e3.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | fee369a184ff99b16f6e954e6bba4b99a22ada6a.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | eb2a24513390c875c8f78075b725fa4cccc458e8.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | 31ef19bbad94ab44866e4e75e4c7ad35fb73d247.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | 377436c803b8fdc2670dd1f7ba490a3e88abfdbb.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | f540df567f17a55f72ac97878eb0355a4f24b723.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | d533f2ffa43ae711732148e1b04c7b188f51d157.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | d1d1c97ec82ac7c073b240165cd3de1f50fbeed5.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.1.1 (16R600) | November 5, 2018 | 1.3 GiB | e5721da8fda5daa3253bed040b7ca00cfa244e00.zip |