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 5.1.2 (16S46) | December 6, 2018 | 1.4 GiB | c292119d35111a47628e1dd0426732a4b33de7f0.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.4 GiB | a0beb638b6a0a681865bda8f9fd7f3c4d498a3f7.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.4 GiB | 6039de5a0ba5b53ec7bc72b88058886222b99580.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.4 GiB | ab30952fe2a177c398fecc1ee4a276c6d8b7a3c5.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.4 GiB | 0949dd5973ea149e745564d041768c2bf669795a.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.4 GiB | d7e547a18a0b2416aacdab3e579f34fbc6241c1e.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 0ee5f52d605295493d211c8c1d2c31a4150a7312.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | f18e6f098248a974b14571ea3b2837b6c7bea832.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | b90010ef5a81d0c5fee9cf11a62322d259063e5c.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 64ed6d5ba1b2af6f1fe29f28c9b234c72be2da46.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | a677c740eebbd41f24ea31d68ccf0a7d2e0acf94.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | 987aa08f88531844ceeb788438d17d553b413afd.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | a5b1af04f9adf920420a84b3b9f3709652fc1bcc.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 74e46ef62a93892738bca6b66bfb4a62cf06381c.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | b17ebc5a9aae4e60d0104e7e4a11d695b52b7b1e.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | c3013e9691310a00241f190f487c55a06fcf92e1.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 20665d5766e2c5dd8c1c390b056b64c4e71fd785.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | ad8327a54e3ae2663a295f2dc0ff27b0e51b6bd5.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 18ca0c143ed0f0dd0e58e1c665a81a8d60d5f9a3.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 193b4031519809a33d30d9ad055aeb8e0ad225c0.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | b67e30f8c0c6380aad4824375315e7a81483ec3d.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | 8b652a5705340b4d1f0999d97eee844dcd26e8b7.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 5d2d87da015459871e707d2c32626c54883c8031.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 1062de3796004e9741942a02513dcf4ba3b29b2d.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 007e1b393ef5dfa9d66a68a1745dc7bb985dd760.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 594f396ff1dead39549d0bd514ae19718cc23458.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | 8189b0675598616b4cb544ba193e38048efcf5aa.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | b03745e3a0e6f83ea508fc3eac345bd7838d6449.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 200563f56316933a567e75445536076036f59181.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | a6e88352507c22c14cb2ee334d3715015b0fb54d.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 9227facdfaa4e04f3723af7dabe683a943004007.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 58085753049010dca505a8c65c6b6ab2d39595b4.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | a61e3fd8ed2eecb1897b51a29d253ce109a8faa3.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.1.2 (16S46) | December 6, 2018 | 1.3 GiB | 1d606d9585f6903689bf349774eb5578a87bf0bf.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.1.2 (16S5042a) | November 7, 2018 | 1.3 GiB | 1d3f461258f8ed130ae9031342b2fb6f21e4716c.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.1.2 (16S5046a) | November 15, 2018 | 1.3 GiB | 26a9043b4bd2503445db3872efbf8e1764bee81b.zip |