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Zeus

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Version 3.1.4 · iOS 17 or later

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© 2026 Zeus. All rights reserved.

Not affiliated with Apple Inc. iPhone and iPad are trademarks of Apple Inc.

  1. IPSW
  2. Apple Watch
  3. Apple Watch Series 4 (40mm, LTE)

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

Model Watch4,3 · Board N141sAP · 75 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 6454
  • watchOS 5586

watchOS 6

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

Update from watchOS 6.2.8

17U224 · Feb 2, 2026 · 188 MB

17U224Feb 2, 2026188 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.2.5

17U224 · Feb 2, 2026 · 261 MB

17U224Feb 2, 2026261 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.2.6

17U224 · Feb 2, 2026 · 261 MB

17U224Feb 2, 2026261 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.3

17U224 · Feb 2, 2026 · 166 MB

17U224Feb 2, 2026166 MBSignedDownload
watchOS 6.3.1LatestSigned

17U224 · Feb 2, 2026 · 1.44 GB

17U224Feb 2, 20261.44 GBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.1

17U224 · Feb 2, 2026 · 556 MB

17U224Feb 2, 2026556 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.1.1

17U224 · Feb 2, 2026 · 546 MB

17U224Feb 2, 2026546 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.0

17U224 · Feb 2, 2026 · 675 MB

17U224Feb 2, 2026675 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.0.1

17U224 · Feb 2, 2026 · 675 MB

17U224Feb 2, 2026675 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.1.2

17U224 · Feb 2, 2026 · 542 MB

17U224Feb 2, 2026542 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.1.3

17U224 · Feb 2, 2026 · 542 MB

17U224Feb 2, 2026542 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.2.1

17U224 · Feb 2, 2026 · 318 MB

17U224Feb 2, 2026318 MBSignedDownload
watchOS 6.3.1Signed

Update from watchOS 6.2

17U224 · Feb 2, 2026 · 318 MB

17U224Feb 2, 2026318 MBSignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.0.1

17U216 · Jan 26, 2021 · 580 MB

17U216Jan 26, 2021580 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.0

17U216 · Jan 26, 2021 · 580 MB

17U216Jan 26, 2021580 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.1

17U216 · Jan 26, 2021 · 458 MB

17U216Jan 26, 2021458 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.2.8

17U216 · Jan 26, 2021 · 76 MB

17U216Jan 26, 202176 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.1.3

17U216 · Jan 26, 2021 · 445 MB

17U216Jan 26, 2021445 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.2.1

17U216 · Jan 26, 2021 · 189 MB

17U216Jan 26, 2021189 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.2

17U216 · Jan 26, 2021 · 189 MB

17U216Jan 26, 2021189 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.1.2

17U216 · Jan 26, 2021 · 445 MB

17U216Jan 26, 2021445 MBUnsignedDownload
watchOS 6.3Unsigned

17U216 · Jan 26, 2021 · 1.44 GB

17U216Jan 26, 20211.44 GBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.2.5

17U216 · Jan 26, 2021 · 133 MB

17U216Jan 26, 2021133 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.2.6

17U216 · Jan 26, 2021 · 133 MB

17U216Jan 26, 2021133 MBUnsignedDownload
watchOS 6.3Unsigned

Update from watchOS 6.1.1

17U216 · Jan 26, 2021 · 447 MB

17U216Jan 26, 2021447 MBUnsignedDownload

watchOS 5

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

16U711 · Mar 24, 2026 · 1.37 GB

16U711Mar 24, 20261.37 GBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.8

16U711 · Mar 24, 2026 · 81 MB

16U711Mar 24, 202681 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.7

16U711 · Mar 24, 2026 · 81 MB

16U711Mar 24, 202681 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.1.3

16U711 · Mar 24, 2026 · 485 MB

16U711Mar 24, 2026485 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.9

16U711 · Mar 24, 2026 · 79 MB

16U711Mar 24, 202679 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.1.1

16U711 · Mar 24, 2026 · 505 MB

16U711Mar 24, 2026505 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.1

16U711 · Mar 24, 2026 · 505 MB

16U711Mar 24, 2026505 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.1.2

16U711 · Mar 24, 2026 · 486 MB

16U711Mar 24, 2026486 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.4

16U711 · Mar 24, 2026 · 83 MB

16U711Mar 24, 202683 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.5

16U711 · Mar 24, 2026 · 83 MB

16U711Mar 24, 202683 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.6

16U711 · Mar 24, 2026 · 83 MB

16U711Mar 24, 202683 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.3

16U711 · Mar 24, 2026 · 84 MB

16U711Mar 24, 202684 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.0

16U711 · Mar 24, 2026 · 522 MB

16U711Mar 24, 2026522 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.1

16U711 · Mar 24, 2026 · 87 MB

16U711Mar 24, 202687 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3

16U711 · Mar 24, 2026 · 92 MB

16U711Mar 24, 202692 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.3.2

16U711 · Mar 24, 2026 · 86 MB

16U711Mar 24, 202686 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.2

16U711 · Mar 24, 2026 · 175 MB

16U711Mar 24, 2026175 MBSignedDownload
watchOS 5.3.10Signed

Update from watchOS 5.2.1

16U711 · Mar 24, 2026 · 137 MB

16U711Mar 24, 2026137 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.1.2

16U693 · Jan 26, 2021 · 475 MB

16U693Jan 26, 2021475 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.1.1

16U693 · Jan 26, 2021 · 494 MB

16U693Jan 26, 2021494 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.1

16U693 · Jan 26, 2021 · 494 MB

16U693Jan 26, 2021494 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.2.1

16U693 · Jan 26, 2021 · 113 MB

16U693Jan 26, 2021113 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.0

16U693 · Jan 26, 2021 · 511 MB

16U693Jan 26, 2021511 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.1.3

16U693 · Jan 26, 2021 · 475 MB

16U693Jan 26, 2021475 MBSignedDownload
watchOS 5.3.9Signed

Update from watchOS 5.2

16U693 · Jan 26, 2021 · 151 MB

16U693Jan 26, 2021151 MBSignedDownload