Apple Watch Series 4 (40mm, LTE) firmware downloads

Model Watch4,3Board N141sAP75 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 · 1.44 GB

    Download

  • watchOS 5.3.10

    Build 16U711 · Mar 24, 2026 · 1.37 GB

    Download

  • watchOS 5.3.9

    Build 16U693 · Nov 5, 2020 · 1.37 GB

    Download

Restoring wipes all data. Back up your device first. How to restore

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, LTE)
watchOS 6.3.1Signed

Update from watchOS 6.2.8

17U224 · Feb 2, 2026 · 188 MB

17U224Feb 2, 2026188 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.6

17U224 · Feb 2, 2026 · 261 MB

17U224Feb 2, 2026261 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.3

17U224 · Feb 2, 2026 · 166 MB

17U224Feb 2, 2026166 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.5

17U224 · Feb 2, 2026 · 261 MB

17U224Feb 2, 2026261 MBSigned
watchOS 6.3.1LatestSigned

17U224 · Feb 2, 2026 · 1.44 GB

17U224Feb 2, 20261.44 GBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1

17U224 · Feb 2, 2026 · 556 MB

17U224Feb 2, 2026556 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.1

17U224 · Feb 2, 2026 · 546 MB

17U224Feb 2, 2026546 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.0

17U224 · Feb 2, 2026 · 675 MB

17U224Feb 2, 2026675 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.0.1

17U224 · Feb 2, 2026 · 675 MB

17U224Feb 2, 2026675 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.2

17U224 · Feb 2, 2026 · 542 MB

17U224Feb 2, 2026542 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.1.3

17U224 · Feb 2, 2026 · 542 MB

17U224Feb 2, 2026542 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2

17U224 · Feb 2, 2026 · 318 MB

17U224Feb 2, 2026318 MBSigned
watchOS 6.3.1Signed

Update from watchOS 6.2.1

17U224 · Feb 2, 2026 · 318 MB

17U224Feb 2, 2026318 MBSigned
watchOS 6.3Unsigned

Update from watchOS 6.0.1

17U216 · Jan 26, 2021 · 580 MB

17U216Jan 26, 2021580 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.0

17U216 · Jan 26, 2021 · 580 MB

17U216Jan 26, 2021580 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1

17U216 · Jan 26, 2021 · 458 MB

17U216Jan 26, 2021458 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.8

17U216 · Jan 26, 2021 · 76 MB

17U216Jan 26, 202176 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.3

17U216 · Jan 26, 2021 · 445 MB

17U216Jan 26, 2021445 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.1

17U216 · Jan 26, 2021 · 189 MB

17U216Jan 26, 2021189 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2

17U216 · Jan 26, 2021 · 189 MB

17U216Jan 26, 2021189 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.2

17U216 · Jan 26, 2021 · 445 MB

17U216Jan 26, 2021445 MBUnsigned
watchOS 6.3Unsigned

17U216 · Jan 26, 2021 · 1.44 GB

17U216Jan 26, 20211.44 GBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.5

17U216 · Jan 26, 2021 · 133 MB

17U216Jan 26, 2021133 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.2.6

17U216 · Jan 26, 2021 · 133 MB

17U216Jan 26, 2021133 MBUnsigned
watchOS 6.3Unsigned

Update from watchOS 6.1.1

17U216 · Jan 26, 2021 · 447 MB

17U216Jan 26, 2021447 MBUnsigned

watchOS 5

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

16U711 · Mar 24, 2026 · 1.37 GB

16U711Mar 24, 20261.37 GBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.8

16U711 · Mar 24, 2026 · 81 MB

16U711Mar 24, 202681 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.7

16U711 · Mar 24, 2026 · 81 MB

16U711Mar 24, 202681 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.3

16U711 · Mar 24, 2026 · 485 MB

16U711Mar 24, 2026485 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.9

16U711 · Mar 24, 2026 · 79 MB

16U711Mar 24, 202679 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.1

16U711 · Mar 24, 2026 · 505 MB

16U711Mar 24, 2026505 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1

16U711 · Mar 24, 2026 · 505 MB

16U711Mar 24, 2026505 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.1.2

16U711 · Mar 24, 2026 · 486 MB

16U711Mar 24, 2026486 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.4

16U711 · Mar 24, 2026 · 83 MB

16U711Mar 24, 202683 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.5

16U711 · Mar 24, 2026 · 83 MB

16U711Mar 24, 202683 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.6

16U711 · Mar 24, 2026 · 83 MB

16U711Mar 24, 202683 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.3

16U711 · Mar 24, 2026 · 84 MB

16U711Mar 24, 202684 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.0

16U711 · Mar 24, 2026 · 522 MB

16U711Mar 24, 2026522 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.1

16U711 · Mar 24, 2026 · 87 MB

16U711Mar 24, 202687 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3

16U711 · Mar 24, 2026 · 92 MB

16U711Mar 24, 202692 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.3.2

16U711 · Mar 24, 2026 · 86 MB

16U711Mar 24, 202686 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.2

16U711 · Mar 24, 2026 · 175 MB

16U711Mar 24, 2026175 MBSigned
watchOS 5.3.10Signed

Update from watchOS 5.2.1

16U711 · Mar 24, 2026 · 137 MB

16U711Mar 24, 2026137 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.2

16U693 · Jan 26, 2021 · 475 MB

16U693Jan 26, 2021475 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.1

16U693 · Jan 26, 2021 · 494 MB

16U693Jan 26, 2021494 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1

16U693 · Jan 26, 2021 · 494 MB

16U693Jan 26, 2021494 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.2.1

16U693 · Jan 26, 2021 · 113 MB

16U693Jan 26, 2021113 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.0

16U693 · Jan 26, 2021 · 511 MB

16U693Jan 26, 2021511 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.1.3

16U693 · Jan 26, 2021 · 475 MB

16U693Jan 26, 2021475 MBSigned
watchOS 5.3.9Signed

Update from watchOS 5.2

16U693 · Jan 26, 2021 · 151 MB

16U693Jan 26, 2021151 MBSigned