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 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | 51da6cb8d93d0b40e60fe33a2b909ab705edf634.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 12832e7121b7463199ba68ddf48f2677fdf3a5fa.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 05688d48bc7215d3fdd0b3e692acfac5ca3c8a30.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 5954dc97a70c1811cb765d15f373cd0f7dd18598.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | bb5c07eb75b95203e9fbc861cead3e4158daae31.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 928d473b70b3e4ec5ea83877b775aebd33471791.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 8460e5ecbea8f5c2f6a1a817b24446514140cce5.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.4 GiB | d85fb31a7dd548fe4a97dd5ad19eb96ce9669e7b.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U569) | July 22, 2019 | 1.4 GiB | 3137fd5c47e23a4eb0004c806d17782ee14471ec.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.4 GiB | 4676e06829437cd0acd416740381ebf1766e4541.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.4 GiB | 2f903da985a8ed694965aa01d6838c8e4a262e49.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.4 GiB | c9921a0fdffe1f2e517303465b89f8d5314dae1f.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.4 GiB | 3c35911120d956c99ae6bb3a895cea89a4e8771c.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.4 GiB | 42dfe3200b645b28a360ad3578feefa822c4d134.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | a9dc7f54104661d6a4deda931b0b36c2d303c39e.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 6d30cd0284cd3a7b0a3060e1756243760a8241a3.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | b76dab189a2772163ca7ed234c1ed35eafb207a1.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | fd844d6f60a32bf2cdaf501c6ddce3d8621c8236.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | d2386184f5898ab417211abf0ea3e6043f416e57.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 942936badf195437486ed816713f2864f8f19479.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 872cc3d54ce0b352dcaa62ac4e4e1afded099bb6.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | b707164101b9531cdfb0d09933215b5142ef01d3.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 32b6c4a0ca87ffadcb9c5a392625e3861d7c44a4.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 680aff9cf9a126008bd929105dd0d0c867d81ec5.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 21849453ae26c4caed6b227f0be5f02986a9152d.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 32baabbaa4e9636a04242906028b8ffdfee9becf.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 619dd8fb28f75ee8d311ef7c827cbb760b48c13e.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 697944fbe41106eec7c165ce0eaabf5dedef05b5.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | acdcb30bbfddea5552156cb33039b91c0e14ea82.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 761772a9a16969ca117d9f8c53174161e809434c.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | c2809bee00d764d8dd2e5494fec8843aceae1c12.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 9acefe62f4d0c309e4755f1beed692000c5be626.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 8cd35313dc945778cfcb46072fbabfef5837e6ac.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 3d6fc4b8faf2a7c241c834e2f4a52a2d2aa40122.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | 512c48f4f61ffaea7faf25d98a2864e54c845fc6.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | 1c0dfd47127212610db09209f8a15a40ba3606ae.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 2ceae88df8518eb7beefc51b4747bced5eacd92d.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 6047bd552df3a6a6ce5c0eb4d0e7426533aa6beb.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 96e2a21a5a515dc8eefe14cfe2d2edf0c17e490e.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 23ee2475c4412f9efad273792e74808df4bf9e71.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 133278b54362d3651b023a2b580ac17edb7a4101.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 839bf9b1d8c5a6c50814f57665ae5a150eb62f32.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 9c6d2b6151543f61008899ebd5313f6f7efbfe98.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 6bb356f7b722981af0467f956170bfc84cd13d32.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | ea927f01d6713b11280408a9a166fa55eb43c9f0.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 1aa21a2e7f2b3759a525c79d9a9564251cdb7c3a.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | e155d747a9e88f716c3e5fea98dac48988f63dbb.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 957878614cf3b92a8f9dd1436d7c27c549e9e49a.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 8607774a35c8f949969c6f0e1724adeb20067907.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | f1da89e86bac6598610ccbb4515c68f32cf6e8e9.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | ecf546eaa45ae8c6f525200716394f414049deaa.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 8a79044718bb42afcffd13028733af9f046d5882.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 271e8ebc6ce89436af82d777d6ef9c82a983b0fe.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 3b07de8773b185e6ef29b12c4c4329b291b2209f.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 77373469fc803caf54771f397ede59702fc34c14.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | 6ed43b30b4c1c2d45fe4d77aeb01895d5c100ad1.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 4919ab73e297c2d60113d66bab68872b556af840.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 05e81b293a7d320fdcac6aa9c43eb94e936cd479.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | f22e7113823118b6ac91e9446005b43f60af254b.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | c927f451a6d6dea8378b8e094c1ceb09effcd715.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 738b2950e137757c3909e298d0a6beadefaf39ae.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | dbad2d37671daf8cee5b689eab1ad1026313cc50.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | b2bce649fbf32cfeefd9ea212c13a8a575369084.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | a8c8e1b611114c45c47327e6a38f9587ef10542b.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 13c313708560942611c93e67dc208a626570e7e1.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 78b9bee7c0c9af1b462e0cd601cb03b39984e499.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 5d21988a50d4f377e70b1942650dacd94bb26d38.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 55829e90a6557c74baffe54c866653b7e658bf3d.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 865ace529712faf2d885896f50866a5d554cdcf6.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 1526413f626940b78f8c28c4e9ac00e0655b02d1.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | e6960dea5e1fc862506a7ac9a143fc38211a959b.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | de2e104ddc6bcec761f664cdaa77325fc3917177.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 214d71c1e18d813eb0a4ededadcddb668d38003b.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 27e74577e8a5ddd01ed68bf7ad1010f66c121c4b.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | 14934eec4be5c1cb8fc314c399da66ca8f0ebe4a.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 8627c8a8ce6fac91608baa3699a830e3b9778a5a.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | ef3603d652812fe3610928891ea14944af52d68e.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U569) | July 22, 2019 | 1.3 GiB | 2aee132017548a16e6d08ce97d2f439df3a54d5b.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U5526f) | May 15, 2019 | 1.3 GiB | 1bad5ed6e8729bc2e9561675dbc990e019483806.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U5537b) | May 28, 2019 | 1.3 GiB | 26b1d83071e770d3f3e825a11a4d9e466c9d6a18.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U5545c) | June 11, 2019 | 1.3 GiB | 6c667fe7a67b31ee150e70f0cd9cb35ba103bc7e.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U5558b) | June 24, 2019 | 1.3 GiB | ac592fdb06f500245426e81a5d1394cc06665326.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U5566a) | July 9, 2019 | 1.3 GiB | 7f817f1937b286a2365c84398bf3ad26b57230ed.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 5.3 (16U5569a) | July 16, 2019 | 1.3 GiB | 511350fdb1b130152aaa2ab078fa52fc0f2eb830.zip |