Apple Watch Series 3 (42mm) firmware downloads

Model Watch3,4Board N121bAP126 versions

Signed now

Apple is signing these versions, so they install with a normal restore.

47 more signed files below.

  • watchOS 6.3.1Latest

    Build 17U224 · Feb 2, 2026 · 1.39 GB

    Download

  • watchOS 5.3.10

    Build 16U711 · Mar 24, 2026 · 1.29 GB

    Download

  • watchOS 5.3.9

    Build 16U693 · Nov 5, 2020 · 1.29 GB

    Download

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All firmware

126 versions

Newest first, every release Apple has published for this model.

watchOS 6

426 files
watchOS 6 firmware for Apple Watch Series 3 (42mm)
watchOS 6.3.1Signed

Update from watchOS 6.3

17U224 · Feb 2, 2026 · 180 MB

17U224Feb 2, 2026180 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.8

17U224 · Feb 2, 2026 · 203 MB

17U224Feb 2, 2026203 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.6

17U224 · Feb 2, 2026 · 273 MB

17U224Feb 2, 2026273 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.5

17U224 · Feb 2, 2026 · 273 MB

17U224Feb 2, 2026273 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.0

17U224 · Feb 2, 2026 · 697 MB

17U224Feb 2, 2026697 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.0.1

17U224 · Feb 2, 2026 · 697 MB

17U224Feb 2, 2026697 MBSigned
watchOS 6.3.1LatestSigned

17U224 · Feb 2, 2026 · 1.39 GB

17U224Feb 2, 20261.39 GBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1

17U224 · Feb 2, 2026 · 581 MB

17U224Feb 2, 2026581 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.1

17U224 · Feb 2, 2026 · 572 MB

17U224Feb 2, 2026572 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.2

17U224 · Feb 2, 2026 · 568 MB

17U224Feb 2, 2026568 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.3

17U224 · Feb 2, 2026 · 568 MB

17U224Feb 2, 2026568 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2

17U224 · Feb 2, 2026 · 323 MB

17U224Feb 2, 2026323 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.1

17U224 · Feb 2, 2026 · 323 MB

17U224Feb 2, 2026323 MBSigned
watchOS 6.3Unsigned

Update from watchOS 6.0

17U216 · Jan 26, 2021 · 601 MB

17U216Jan 26, 2021601 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.0.1

17U216 · Jan 26, 2021 · 601 MB

17U216Jan 26, 2021601 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1

17U216 · Jan 26, 2021 · 482 MB

17U216Jan 26, 2021482 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.8

17U216 · Jan 26, 2021 · 80 MB

17U216Jan 26, 202180 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.5

17U216 · Jan 26, 2021 · 143 MB

17U216Jan 26, 2021143 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2

17U216 · Jan 26, 2021 · 191 MB

17U216Jan 26, 2021191 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.1

17U216 · Jan 26, 2021 · 471 MB

17U216Jan 26, 2021471 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.6

17U216 · Jan 26, 2021 · 143 MB

17U216Jan 26, 2021143 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.3

17U216 · Jan 26, 2021 · 469 MB

17U216Jan 26, 2021469 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.2

17U216 · Jan 26, 2021 · 469 MB

17U216Jan 26, 2021469 MBUnsigned
watchOS 6.3Unsigned

17U216 · Jan 26, 2021 · 1.39 GB

17U216Jan 26, 20211.39 GBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.1

17U216 · Jan 26, 2021 · 192 MB

17U216Jan 26, 2021192 MBUnsigned

watchOS 5

1097 files
watchOS 5 firmware for Apple Watch Series 3 (42mm)
watchOS 5.3.10Signed

16U711 · Mar 24, 2026 · 1.29 GB

16U711Mar 24, 20261.29 GBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.9

16U711 · Mar 24, 2026 · 73 MB

16U711Mar 24, 202673 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.8

16U711 · Mar 24, 2026 · 75 MB

16U711Mar 24, 202675 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.6

16U711 · Mar 24, 2026 · 77 MB

16U711Mar 24, 202677 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.7

16U711 · Mar 24, 2026 · 75 MB

16U711Mar 24, 202675 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.4

16U711 · Mar 24, 2026 · 77 MB

16U711Mar 24, 202677 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.5

16U711 · Mar 24, 2026 · 77 MB

16U711Mar 24, 202677 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.3

16U711 · Mar 24, 2026 · 77 MB

16U711Mar 24, 202677 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.2

16U711 · Mar 24, 2026 · 80 MB

16U711Mar 24, 202680 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.1

16U711 · Mar 24, 2026 · 496 MB

16U711Mar 24, 2026496 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.2

16U711 · Mar 24, 2026 · 481 MB

16U711Mar 24, 2026481 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.3

16U711 · Mar 24, 2026 · 481 MB

16U711Mar 24, 2026481 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.0.1

16U711 · Mar 24, 2026 · 512 MB

16U711Mar 24, 2026512 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.1

16U711 · Mar 24, 2026 · 82 MB

16U711Mar 24, 202682 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.0

16U711 · Mar 24, 2026 · 512 MB

16U711Mar 24, 2026512 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1

16U711 · Mar 24, 2026 · 496 MB

16U711Mar 24, 2026496 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3

16U711 · Mar 24, 2026 · 87 MB

16U711Mar 24, 202687 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.2.1

16U711 · Mar 24, 2026 · 130 MB

16U711Mar 24, 2026130 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.2

16U711 · Mar 24, 2026 · 164 MB

16U711Mar 24, 2026164 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1

16U693 · Jan 26, 2021 · 485 MB

16U693Jan 26, 2021485 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.1

16U693 · Jan 26, 2021 · 485 MB

16U693Jan 26, 2021485 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.0.1

16U693 · Jan 26, 2021 · 502 MB

16U693Jan 26, 2021502 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.0

16U693 · Jan 26, 2021 · 502 MB

16U693Jan 26, 2021502 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.2

16U693 · Jan 26, 2021 · 470 MB

16U693Jan 26, 2021470 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.3

16U693 · Jan 26, 2021 · 470 MB

16U693Jan 26, 2021470 MBSigned

watchOS 4

461 files
watchOS 4 firmware for Apple Watch Series 3 (42mm)
watchOS 4.3.2Unsigned

15U70 · Jul 9, 2018 · 1.13 GB

15U70Jul 9, 20181.13 GBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.2

15U6070 · Jul 9, 2018 · 59 MB

15U6070Jul 9, 201859 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.1

15U70 · Jul 9, 2018 · 81 MB

15U70Jul 9, 201881 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 122 MB

15U70Jul 9, 2018122 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.1

15U70 · Jul 9, 2018 · 101 MB

15U70Jul 9, 2018101 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 164 MB

15U70Jul 9, 2018164 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 167 MB

15U70Jul 9, 2018167 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.1

15U70 · Jul 9, 2018 · 105 MB

15U70Jul 9, 2018105 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.2

15U6070 · Jul 9, 2018 · 70 MB

15U6070Jul 9, 201870 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 122 MB

15U70Jul 9, 2018122 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.2

15U6070 · Jul 9, 2018 · 64 MB

15U6070Jul 9, 201864 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 126 MB

15U70Jul 9, 2018126 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.1

15U70 · Jul 9, 2018 · 111 MB

15U70Jul 9, 2018111 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 155 MB

15U70Jul 9, 2018155 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.1

15U70 · Jul 9, 2018 · 61 MB

15U70Jul 9, 201861 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3.1

15U70 · Jul 9, 2018 · 82 MB

15U70Jul 9, 201882 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.2.3

15U70 · Jul 9, 2018 · 340 MB

15U70Jul 9, 2018340 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U70 · Jul 9, 2018 · 114 MB

15U70Jul 9, 2018114 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.2

15U70 · Jul 9, 2018 · 340 MB

15U70Jul 9, 2018340 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.0

15U70 · Jul 9, 2018 · 378 MB

15U70Jul 9, 2018378 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.1

15U70 · Jul 9, 2018 · 353 MB

15U70Jul 9, 2018353 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.2.2

15U70 · Jul 9, 2018 · 340 MB

15U70Jul 9, 2018340 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.2.2

15U5069a · Jun 25, 2018 · 340 MB

15U5069aJun 25, 2018340 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.2.3

15U5069a · Jun 25, 2018 · 340 MB

15U5069aJun 25, 2018340 MBUnsigned
watchOS 4.3.2Unsigned

Update from watchOS 4.3

15U5069a · Jun 25, 2018 · 153 MB

15U5069aJun 25, 2018153 MBUnsigned