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 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 6a6bd8f77e61568e578f46eec4b47cc9938c8afc.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | 98f1c92df3b0471d65a8929e767574a82e363663.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | b9aacaac2aab77224122bb28d4d42ecbf3da0f70.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | d0e44dbc7cbf074eef7ed628c662bb5665ea7f2d.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | a3e3fb671dc1df2c21f8bffa8a080923650895dd.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | c0b9e4ee92b61ff160aae140c59604f6e9acb7e4.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 64af4572405c83289672216a205c69e5b661998a.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | 3ff251041589257344312dee84a009e7eb0f8931.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | 3ad7361e80518cfcddb6ed7fff1b8d58a2b57f75.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | a3a76d4f85d55d91b6bb1cf1e0d270c10b2b68e4.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | d0b45140e511e09374d2db25c7612787e65b0795.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | 380a5fbcefae8bfaf38e4fd31e4f314dcc0fdbaf.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.2 GiB | 5d87065043d2e19617a24f1c3864a6004c1fe690.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.2 GiB | 93ab3d8699de82649e3283b5a1155ae13b603040.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.2 GiB | 8efb6719e8636a698439666b33736def0346e100.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.2 GiB | 8fb7355ed74349bd524704adfc8c7de94df863dc.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.2 GiB | bfd3b70e8b335a8df9fbaca8172ee7b21a76cd35.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.2 GiB | f44246376df5c9c11fa33d8a2bacd7486af30216.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.2 GiB | 0bc069683103e29037485a28b4c5ef85bb05bb8e.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.2 GiB | 9259e1eb446fb82918652564fbf82276c448834f.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.2 GiB | 15842e265c4f33359937eddf3a359beb464d8110.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.2 GiB | 3e3f87df8ae2bca1d0f7bb803f8425ec96ee9598.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.2 GiB | 64c26c54f024815e8cf2b979b7df481ed6c50fba.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.2 GiB | f65fd825c57616485543e59e74eb1d7b2cad9c79.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | 6ed8b51e202a0d810e38359603977a878c50a356.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 5009ac021d2ec6dc56999055ec962baafdbf52b8.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | d1dbf10885271e8a05ff088bc8991996c031acf0.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | ac049f8e5ee2cf060109520f087e071d552b0801.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | b2cec02859555a9c20cdf8e99f3fb3788590a0d7.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | 27847e1304c17cd2168990f825a2e20bba39edeb.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | f0b5bd24e016cb8fe9bbf43da1ad66218d106f72.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | 52a6cb3aeb7706045dcb462c2d1d08cfa0810873.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | 7d5a69414127cca15b36eb9d9d957164235968cb.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | bb4d686414a166f48d1d3917ec40482a51e98581.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | d1a87496d8bbb1d96f431c95b9c222cce41a757c.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | d5817181b993fb2181ebc80f5cc4f091e0ea845d.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | 613f039c7afb6c78423e6667b43c15206fd32137.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 42ace092f9e02357781f4c20f940cf4314e3820f.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | 23159fd1b0a4872f8ee872f71166607174dba207.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | 616718f946b884bd13a47d1ae71e2c3a82083663.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | de3c478adff67f7349f95b7a7f32763123b22e91.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | a993780d55dc01652a93220d6611ac3d3439da9e.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | e052bbf797500e36aee7789a5dead98411d46d10.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | 99f1787114c9df424de80d34f82d33131282e874.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | 5217010976f79427646978daa74cd6bd8a0e1c22.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | 6775014cc5b4f31372c7f6b92c3321da51bfe13e.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | 733617d5acb9d91fb6bc1da66008a5a75b776153.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 13e6bf6e6b27fdf265906465033d1411b5734e5a.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 4794e9f84f14f91f2c0a5b754b79db526e03329b.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | 23c6f50ed458d95db4d18c83b2cd765928a287eb.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | 7b7223e27183d78356041cda66177da682f805e8.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | caf38b21d8d099fde1b5fff05990cf24de59dc2c.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | f0a11e0e980908bf3dcf8a182f329155b4ae6936.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | d95a0ff6a67ede818078890f1b953da65b7be92f.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3.1 (15T567) | May 29, 2018 | 1.1 GiB | 6439bc8dd1cf815c702f157e28a201a936d5099d.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3.1 (15T5535b) | April 2, 2018 | 1.1 GiB | 4d74dd8e1c749ae9dee34a4e2c917413e8cd2318.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3.1 (15T5545b) | April 16, 2018 | 1.1 GiB | c796926fb5748b801c8c6d86ee916a3610b16f4b.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3.1 (15T5555c) | May 1, 2018 | 1.1 GiB | f2a41eaedd37017f7a1c95798c1b149affc0fc19.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3.1 (15T5565a) | May 7, 2018 | 1.1 GiB | 3bc948a2adb1b32707068f8ee09f557d146b8bd8.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3.1 (15T5567a) | May 14, 2018 | 1.1 GiB | 2fad03f908d87823c43e4dce9554c659aa7eb376.zip |