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 (15T5212a) | March 16, 2018 | 1.1 GiB | 3702c781aae474cb84f01fa5d27aeda55fccf04f.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.5 GiB | 6426449377511752d1b3d9e564f2e1bfe92cb889.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.5 GiB | 62d40cf2ae840f652b354b50116bd2e8b45d51a2.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.5 GiB | bc218fe94ae5dfb5d2c305223e346da69b8e810d.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | c09796376d8570376626e33fb8128326661b0d69.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | a0c72dc5e9061a6a22efe07c9eb8f8ae5cbc83fb.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 9e820c5f05fda45fbe781d8bf336e0d96e5a2c50.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | 2862ce41c84cae113bfd1fd71d1e4071c14f6043.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 17cf82ad1c7765a7f0b3e0b762a27865ac30e8a0.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.5 GiB | 63cb4dba51e991f919adeb4ccc890447b8042ce5.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.5 GiB | 77776ad08de8c973220902c391951104a91d1f9a.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | db72510a368fb48ac237a5272e9872a64dd02796.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.5 GiB | f754e99c3031627f4479461ceecd0bc188a29659.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | 75af752896a0dbd529cee5c30284a054f7e9ea96.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.6 GiB | 4bf28c3b7c55cc0c84981d5f1a56749de18380e7.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T212) | March 29, 2018 | 1.2 GiB | 263d9586ff54823be95f9672a3f8766c68351c86.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.6 GiB | 23937c4178b37ad88a63f84a7508bc6d00872c15.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.6 GiB | c948720fe9fa3ce1e07909b6448721d4300caf72.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.2 GiB | 05451ee456ec40ab7c164b08a2d6f1dfe3a5e9db.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.2 GiB | b2d1f96a7a1d115a9191c7be933dccd103049bff.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.2 GiB | a2f52d8bd7474dc4b027f1ce1bcf384434972aa9.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.2 GiB | 26c3fd9a8880a7542db4f1837581be69e5595cde.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T212) | March 29, 2018 | 1.2 GiB | 7053001e9b3cb065dbe38f0a5105a05ef306340a.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.6 GiB | dcf2d2f6f9d77dedc57888feac2ffd72e3bd8ae5.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.6 GiB | fb2929f5cfa3c96fcd240c3f1d12ef673418fd9d.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.6 GiB | 7cebb493a98794fc427bb6cdeb875e4ac897f5ca.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.2 GiB | f5614d25efc47fee7d156fb98cd57f1ea358e35f.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.2 GiB | d40085294fbbb3cce2d8eb7240c60111e2bfdd33.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 48bb5408278bb0576a64e9274a22508f19a1c1e2.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.1 GiB | be657f847b4049520301fcefa3a5bee9c3ad1409.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.1 GiB | 38cb721086c6e8ace8ce2120856c58b4d5227ab3.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.1 GiB | 4347ffadeee45fedb537b0ac566cd89a790c4896.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | 4c7c2fe9c4f7b5bab36f33d57496d6b9709aa625.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | a88205b708cda3a26e3b316bd76c0c0e2d6e6518.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | 8eb324410e218d519d72b1f43eac6f5aef6a4c07.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.1 GiB | 8e659ee2aee50eb115a49963ab88c6ca12227dc7.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 72f7e03420f14f9778aebf2378dc6241bfe503a4.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.1 GiB | d8a14c0eeb3c2386ef33e1b9654f4295ac26af63.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.1 GiB | a565e0c0c1a8c97e611e947f28c8765a17ca205e.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | f4ceb4e163e95ac7ca4362eb04ad64bb14382418.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | 2475f1ad20dafbd0115342aec622071f69062bdd.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | daadb237bf84bbcbec33b9f12402998cb2c3dbf3.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 8e18014b6afe1ab12e9d8fd5cc57eae085a2b02e.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.1 GiB | 4b637ba0b5556cad8f26f493f6b81a266db5c071.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.1 GiB | c5b85a0476bcf03aec3ba4ed156a18a62db7b74e.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.1 GiB | 62cea579ea740a08f90298326c81eacfc2bf47c4.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | 3a652d2078241cd33c521892180b09cc5efaf51b.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | f46f2e4ba757eb3f3b6f3bd33be504f01cd1bda7.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | d25e0fbda1bbc5ccc826bb4cd22567a4ded594b8.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.1 GiB | d0c93d301ab1b8e57b2cf6629d9baaf27f28a16a.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | ad85bbd3972d72820a613cc5ffb527a67f359cdf.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.1 GiB | 9dce621f5814f30702e2f11be40d8688cf26e3b8.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.1 GiB | 412ef86524921961c303ef8e119c0aa401a1fdde.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | f67f74114d74aca6b4f907b5bd5a56d950a72403.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | 80bdf08b07769a69ad38333f5b3b22def59e5348.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | 7e65b3119828da725058c860b91bbc4d2e5ba366.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | abc65237c19e07a399948f913e359475ef2dd9b6.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 734a68921b8db6170cf96adbff195a264f5e0bb2.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.1 GiB | f56b35ee2f9f5882c5e6b0da8389b34c7c0f66e7.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.1 GiB | 44d4552176ba19fc7dff2c7c73817f871d2be834.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.1 GiB | 10f03976a46e3644d2c81b716a5a7234077c3fa3.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | 54d13eecfd25494e4ec727c9c6796a5d0005db35.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | 5476dbf445ee24230b3be1d7e70ce6217bbd4eb1.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T212) | March 29, 2018 | 1.1 GiB | 89b8ad27435fe827a958996bd37cfb8de9734fad.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T5165e) | January 25, 2018 | 1.1 GiB | 2161bb3071729e1774b4f9a23a214f4cdafbc13b.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T5176c) | February 7, 2018 | 1.1 GiB | 7f4999ec3655fcec721f001ec6d36bda17e13d4b.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T5187e) | February 21, 2018 | 1.1 GiB | 6dc8f98be3cdc782bd1b12cf44fd93e25f756513.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T5199f) | March 6, 2018 | 1.1 GiB | c2a379e2b98004408d9a13a4e5d64250d05c2cae.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T5209a) | March 12, 2018 | 1.1 GiB | 2b32c51804a7587937ad15959c9cdbfe0bd76f98.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.3 (15T5212a) | March 16, 2018 | 1.1 GiB | 86b81ec4b5dc5b71ae237853f3fdbc47a6e84a8f.zip |