Apple Watch Series 4 (40mm) firmware downloads

Model Watch4,1Board N131sAP75 versions

Signed now

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

45 more signed files below.

  • watchOS 6.3.1Latest

    Build 17U224 · Feb 2, 2026 · 1.40 GB

    Download

  • watchOS 5.3.10

    Build 16U711 · Mar 24, 2026 · 1.34 GB

    Download

  • watchOS 5.3.9

    Build 16U693 · Nov 5, 2020 · 1.34 GB

    Download

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All firmware

75 versions

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

watchOS 6

454 files
watchOS 6 firmware for Apple Watch Series 4 (40mm)
watchOS 6.3.1Signed

Update from watchOS 6.2.5

17U224 · Feb 2, 2026 · 250 MB

17U224Feb 2, 2026250 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.6

17U224 · Feb 2, 2026 · 250 MB

17U224Feb 2, 2026250 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.3

17U224 · Feb 2, 2026 · 155 MB

17U224Feb 2, 2026155 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.8

17U224 · Feb 2, 2026 · 177 MB

17U224Feb 2, 2026177 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2

17U224 · Feb 2, 2026 · 298 MB

17U224Feb 2, 2026298 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.1

17U224 · Feb 2, 2026 · 298 MB

17U224Feb 2, 2026298 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1

17U224 · Feb 2, 2026 · 531 MB

17U224Feb 2, 2026531 MBSigned
watchOS 6.3.1LatestSigned

17U224 · Feb 2, 2026 · 1.40 GB

17U224Feb 2, 20261.40 GBSigned
watchOS 6.3.1Signed

Update from watchOS 6.0

17U224 · Feb 2, 2026 · 651 MB

17U224Feb 2, 2026651 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.0.1

17U224 · Feb 2, 2026 · 651 MB

17U224Feb 2, 2026651 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.3

17U224 · Feb 2, 2026 · 518 MB

17U224Feb 2, 2026518 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.2

17U224 · Feb 2, 2026 · 518 MB

17U224Feb 2, 2026518 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.1

17U224 · Feb 2, 2026 · 521 MB

17U224Feb 2, 2026521 MBSigned
watchOS 6.3Unsigned

Update from watchOS 6.0.1

17U216 · Jan 26, 2021 · 557 MB

17U216Jan 26, 2021557 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.0

17U216 · Jan 26, 2021 · 557 MB

17U216Jan 26, 2021557 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1

17U216 · Jan 26, 2021 · 436 MB

17U216Jan 26, 2021436 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.1

17U216 · Jan 26, 2021 · 425 MB

17U216Jan 26, 2021425 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.6

17U216 · Jan 26, 2021 · 127 MB

17U216Jan 26, 2021127 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.5

17U216 · Jan 26, 2021 · 127 MB

17U216Jan 26, 2021127 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.8

17U216 · Jan 26, 2021 · 70 MB

17U216Jan 26, 202170 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.1

17U216 · Jan 26, 2021 · 174 MB

17U216Jan 26, 2021174 MBUnsigned
watchOS 6.3Unsigned

17U216 · Jan 26, 2021 · 1.40 GB

17U216Jan 26, 20211.40 GBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.3

17U216 · Jan 26, 2021 · 423 MB

17U216Jan 26, 2021423 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.2

17U216 · Jan 26, 2021 · 423 MB

17U216Jan 26, 2021423 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2

17U216 · Jan 26, 2021 · 174 MB

17U216Jan 26, 2021174 MBUnsigned

watchOS 5

586 files
watchOS 5 firmware for Apple Watch Series 4 (40mm)
watchOS 5.3.10Signed

Update from watchOS 5.3.9

16U711 · Mar 24, 2026 · 65 MB

16U711Mar 24, 202665 MBSigned
watchOS 5.3.10Signed

16U711 · Mar 24, 2026 · 1.34 GB

16U711Mar 24, 20261.34 GBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.8

16U711 · Mar 24, 2026 · 67 MB

16U711Mar 24, 202667 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.6

16U711 · Mar 24, 2026 · 69 MB

16U711Mar 24, 202669 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.7

16U711 · Mar 24, 2026 · 67 MB

16U711Mar 24, 202667 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.3

16U711 · Mar 24, 2026 · 69 MB

16U711Mar 24, 202669 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.5

16U711 · Mar 24, 2026 · 69 MB

16U711Mar 24, 202669 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.4

16U711 · Mar 24, 2026 · 69 MB

16U711Mar 24, 202669 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.2

16U711 · Mar 24, 2026 · 72 MB

16U711Mar 24, 202672 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.2

16U711 · Mar 24, 2026 · 466 MB

16U711Mar 24, 2026466 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.1

16U711 · Mar 24, 2026 · 73 MB

16U711Mar 24, 202673 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.3

16U711 · Mar 24, 2026 · 466 MB

16U711Mar 24, 2026466 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3

16U711 · Mar 24, 2026 · 78 MB

16U711Mar 24, 202678 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.1

16U711 · Mar 24, 2026 · 484 MB

16U711Mar 24, 2026484 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1

16U711 · Mar 24, 2026 · 484 MB

16U711Mar 24, 2026484 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.0

16U711 · Mar 24, 2026 · 502 MB

16U711Mar 24, 2026502 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.2

16U711 · Mar 24, 2026 · 159 MB

16U711Mar 24, 2026159 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.2.1

16U711 · Mar 24, 2026 · 121 MB

16U711Mar 24, 2026121 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.1

16U693 · Jan 26, 2021 · 473 MB

16U693Jan 26, 2021473 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.0

16U693 · Jan 26, 2021 · 492 MB

16U693Jan 26, 2021492 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1

16U693 · Jan 26, 2021 · 473 MB

16U693Jan 26, 2021473 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.2

16U693 · Jan 26, 2021 · 454 MB

16U693Jan 26, 2021454 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.2

16U693 · Jan 26, 2021 · 144 MB

16U693Jan 26, 2021144 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.3

16U693 · Jan 26, 2021 · 454 MB

16U693Jan 26, 2021454 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.2.1

16U693 · Jan 26, 2021 · 106 MB

16U693Jan 26, 2021106 MBSigned