watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

697.56 MB

Release Date

2026-02-02T18:44:25Z

Update Type

Normal release

Delta update - requires 6.0.1 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (38mm) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2026-02-02T18:44:25Z. The update package is 697.56 MB. This is a delta (partial) update that requires 6.0.1 to already be installed on the device - it cannot be applied from scratch. This update is currently signed by Apple, so it can be applied directly from Settings › General › Software Update.

The OTA payload file is 2088949f04b8c5e5c70c4115bbbdb9f1ccbe2eed.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32152/F0E432B0-C5BB-4232-ABAE-5BE5DA282C81/com_apple_MobileAsset_SoftwareUpdate/2088949f04b8c5e5c70c4115bbbdb9f1ccbe2eed.zip