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 4.1 (15R846) | October 20, 2017 | 1.5 GiB | 6f4ddf62592873ff3ed8f9c5190b748ec664c54b.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.5 GiB | b3a3fd022c87779c7454c2768ebb9fe7f5bf1bca.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.5 GiB | 60098d561a2dd528c691d79818210610b7453540.zip |
| ✗ | Apple Watch Series 3 (42mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.5 GiB | 1b63aa988662b301736ce9c5cad6f2674cbd1a40.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.5 GiB | 27747fe58f8dd11ff70d2889162253dd28806584.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.5 GiB | 31cd2e742627df9453bfbb876b91688cc5399679.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.5 GiB | da3d0d73000e8ae8d6c9450169666018bfc7216a.zip |
| ✗ | Apple Watch Series 3 (38mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.5 GiB | 5e6abb1b4ac4ff3e9c1708f39ff7a415fe5624fb.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.6 GiB | f9928b5583a26b46ab81c8923334799933eaeff3.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.6 GiB | d576dd892bccd8ddcf0602138e2cb67b817b3c54.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.6 GiB | fa719fab3b674174e0f9cc8a8e0d3843f6fa1418.zip |
| ✗ | Apple Watch Series 3 (42mm, LTE) | watchOS 4.1 (15R846) | October 20, 2017 | 1.6 GiB | b849e61e345500b30b31c79d9bf7a56159c41e93.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.1 (15R846) | October 20, 2017 | 1.6 GiB | 4d581f84985b144ef4ce290f90d6ad4db2a7b5e6.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.6 GiB | 286d7f12e51b4a39fb84299bb34950f513040589.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.6 GiB | 9401a830577ef88fa26fcb0427d251f3cbff45c2.zip |
| ✗ | Apple Watch Series 3 (38mm, LTE) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.6 GiB | 3f1f175b020451c504cd005cbf720509ad8d78ae.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.1 GiB | ea7cec568295401c0f4e13d844121fe0ccdc18b1.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.1 GiB | 6dbcdb5dc415c4f890e4153bd51d98ad6425cd8a.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.1 GiB | 4fa6032700563cebc10449b5a850af89679f3808.zip |
| ✗ | Apple Watch Series 1 (42mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.1 GiB | 5e2ae6d7655bb5b619f92adfa444299efed04683.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.1 GiB | 94ed661322997644279a2a118c00d2f0c353eca0.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.1 GiB | 3960d3c9d06363bd4fefb3f55ac91ddaccf994e5.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.1 GiB | 0f5c0f844e20e12d77713838198e12fec07be790.zip |
| ✗ | Apple Watch Series 1 (38mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.1 GiB | 2af9aaea7ce4e056b311da006b2ca6cea7b47044.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.1 GiB | f35f0fef8c93c4f6ed648fb0f88d60e7315e2aad.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.1 GiB | 07366c3edc47c38d35b334a456cbfbbc17af5f5c.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.1 GiB | 0ca4bc1ed68def6eb5820c555198cb8a24759d5a.zip |
| ✗ | Apple Watch Series 2 (42mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.1 GiB | 67469f9ab8e6e571ca865ae41bbee67461d86017.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.1 GiB | a172fa5ae7a6d643ee21d3799d4c7c4af03c59e7.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.1 GiB | b5e8b1bd3c0eceff5603d70ceeef5eaffa25937c.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.1 GiB | 683bce9472a116a97ebde690829105ff0ff04670.zip |
| ✗ | Apple Watch Series 2 (38mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.1 GiB | b5e791ee7a0d64bb42226032beb3b2e569422067.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.1 GiB | 072e4b836092c9054f77f3fa72fc2c74c8ed0777.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.1 GiB | afbcb34ce11e27a114fdcdf12aad8b7e73ef8910.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.1 GiB | 9a4abdb27377a45404e81549fce952c8a0d81e90.zip |
| ✗ | Apple Watch (42mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.1 GiB | b9e191b227fb413b7f09f02efcf10536fa03747d.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.1 (15R846) | October 20, 2017 | 1.1 GiB | 77bbcfd1358c1d9798253ae547a639b341fa3bd2.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.1 (15R5823c) | September 27, 2017 | 1.1 GiB | 50f457cd608aa11cb5066f61a52def51b101624e.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.1 (15R5835d) | October 9, 2017 | 1.1 GiB | 31e79bc02636667277ee12df32db7c9e476194d6.zip |
| ✗ | Apple Watch (38mm) | watchOS 4.1 (15R5843a) | October 16, 2017 | 1.1 GiB | 4833e5d376dce1708ec246159acf2f880c2501fd.zip |