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 3 (42mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.6 GiB | 0a429a6d68419f39f4cac01980e1a8cd70ae6c4a.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.5 GiB | 23bd1242f7c20ce6390f0b20464253deb7b7bcb8.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.5 GiB | ca9a7bf35e8472ee6b898df74c45d6c15d559431.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.5 GiB | f7743a9f4074b7dd924eea55fe4e036ae164b07c.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.5 GiB | 5b2b179748f8af9f157c85062482d553cfd69b79.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.5 GiB | d83297c6fed231ebe84452d38c6acdc652b9cc73.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.6 GiB | 3bb58a7068ac4ffa929c7452546a5dd953e04297.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.5 GiB | d89e1f9c1440b2cb0cda25cde705ad3e26eb1673.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.5 GiB | 1dd9746c4858f43e6886b38fef7ed7c96798e195.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.5 GiB | 2037350056a8310d9141d42d5d750262dba9c5d8.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.6 GiB | 9cc19430649ff3cf0ace5d4aa880b4d32e6314ef.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.2 (15S102) | December 5, 2017 | 1.6 GiB | 659c304c7d3b1d5a209beb9284bbf4bb65fabbd7.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.7 GiB | bb3aa13b4c5e8591fac1115c67589b3e0e5e5509.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.6 GiB | 56a73744562997df2cfe877ae0de6f3d88061b6f.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.6 GiB | 6b49762848d952ecd539e0d852d5ba9634373f22.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.6 GiB | 548d443d6abab856ff0fea0516cdb05d57634243.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.7 GiB | 14c8b06893c1b8b59783f32fb8ae9145dba030f5.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.6 GiB | 582d38e90d80cde8cf3913db1d0f85c3a406dd65.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.6 GiB | 65c37985137008db36fe7479af0450681837f928.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.2 (15S102) | December 5, 2017 | 1.6 GiB | fcb0d5bbcc471b6a9e725188f011aa59a8c4a5bb.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.1 GiB | 20f9a6fe30df33fc78449824bb82587ed725597e.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.1 GiB | b79d3f1e9f28db6c2a207fdf698948e8bfea2406.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.1 GiB | ce189a0e68ce8703aedd463d3fe347a1e51264ce.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.1 GiB | 5e631e2c81ebf6d4ea6b5cd2fe5a4cb4503d2547.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.1 GiB | 638d5f409f1b33e713ac3b704c51991fec0c010a.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.1 GiB | 848286e395b235179aab9324d4b7d584efdd7869.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.1 GiB | cad7c481e1f93c5892c911268a4b5002941588ce.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.1 GiB | ee57e3b92399e187bd57c67cf20f62ff88abe2e9.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.1 GiB | d3b9a2d53d6924b44490a1de4004b754349ac6a4.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.1 GiB | 0e09459827ccb01362d929c19095fd511946774d.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.1 GiB | 0358cfbf71016e7cc5746e469830f40b298c7e81.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.1 GiB | 6ea15a1a42f43020613d9e8b4498d121fcc34b6e.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.1 GiB | e7852b3a53ab1b8b5daa8ce4bd46f15053db14e7.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.1 GiB | 0b82509acde3fc3fae26c81491641b6d168288a9.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.1 GiB | 366c11f6d313390c57e1afb6236fcec6aab3ace4.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.1 GiB | 17b7438ced6fd17e72d901fd80f0002a9aefd42f.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.1 GiB | e8fb9358037c7f72ac47ea83cd83d5a5b016520d.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.1 GiB | 3c78ba26c295782b0d8f09569e4ee7831e4d0e8f.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.1 GiB | 4be334373e1dc7c86aa89ce497eeec46aa0203aa.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.1 GiB | 2a5902e0f39f144d8b1e665f32fbd58126def062.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.1 GiB | dc6a2fa84fbe4be886313ba338e5d33dd98c476d.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.1 GiB | 03348ce419820a30b048e044596acb67d98b7932.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.1 GiB | 84ab79fc4489b919d73344561db1c93422cbc770.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.1 GiB | b94538905a797c2a2ef423f4afba1c9f9efae33d.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.1 GiB | 8de42cc4e554376e623da175c3e203c98989740d.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.2 (15S102) | December 5, 2017 | 1.1 GiB | 4976b6ab8c808397a226257fcba08322cd168597.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.2 (15S5085b) | October 30, 2017 | 1.1 GiB | c223aaacdeca4c455da3a3bc3843024ccf36b615.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.2 (15S5090c) | November 6, 2017 | 1.1 GiB | 13256c0329e8f5ed4e6b355cf14d0fc7f3cd3036.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.2 (15S5100a) | November 13, 2017 | 1.1 GiB | 4be43a5722df071c1f694aa9d41915ce088ab02b.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.2 (15S5102b) | November 17, 2017 | 1.1 GiB | 760a7b3b3c2fc22fe6ae2d0b6612c065b4bb9466.zip |