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 2 (38mm) | watchOS 6.3 (17U208) | December 14, 2020 | 1.4 GiB | 644cbbdc723ec9111df287eb7e617a87f765f144.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 6.3 (17U208) | December 14, 2020 | 1.4 GiB | 892a5a68940290978a24f2a9e06aacdad61ef923.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 6.3 (17U208) | December 14, 2020 | 1.4 GiB | 916c7c381f6173bff2a8ebec8fe5539cc8dde8dc.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 6.3 (17U208) | December 14, 2020 | 1.4 GiB | 501b410e3bce7cf5b3743bb9349acb74d8e773e5.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | cba42384fea456b333e026bb87edc02389c5bb57.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 9e53a719b53e5b3206bf81f17df2116ae62d0341.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 09767515de464388db188e19ff7852b3aabef707.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | c8614502b96123c4c50a51cb8cd50c97be39a506.zip |
| ✗ | Apple Watch Series 4 (44mm) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | c6f6c36bb8e0c7f7e9787f7c01beb20a0287c14f.zip |
| ✗ | Apple Watch Series 4 (40mm) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 5e35b2a4354205dccbdbc58e2975d1dd7d7c3c24.zip |
| ✗ | Apple Watch Series 4 (40mm, LTE) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | e0644bfb51965889e419741ed70dc6bfa8736e54.zip |
| ✗ | Apple Watch Series 4 (44mm, LTE) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 7f80d97fd20de573115c9b9d3cc88f150fc816da.zip |
| ✗ | Apple Watch Series 5 (40mm) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 63caaac5296a888a56fbc8cd4676f96d48b315ca.zip |
| ✗ | Apple Watch Series 5 (44mm) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 2eb8e3308acb08ae50bf70e60643221f407c5d4e.zip |
| ✗ | Apple Watch Series 5 (40mm, LTE) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 9a5c2f87dbdbe3a503ff5b1bc3ed527b2175ae7b.zip |
| ✗ | Apple Watch Series 5 (44mm, LTE) | watchOS 6.3 (17U216) | January 26, 2021 | 1.4 GiB | 94df61e66b4af2fed7cc69089de0b7cbd82856e8.zip |