watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

568.39 MB

Release Date

2026-02-02T18:44:29Z

Update Type

Normal release

Delta update - requires 6.1.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 3 (42mm) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2026-02-02T18:44:29Z. The update package is 568.39 MB. This is a delta (partial) update that requires 6.1.3 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 c6e7860799fe9a51b2f99ed639a8ab0700174e1e.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32134/9860D380-D316-4B98-B743-735B10084BA9/com_apple_MobileAsset_SoftwareUpdate/c6e7860799fe9a51b2f99ed639a8ab0700174e1e.zip