watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

604.01 MB

Release Date

2026-02-02T18:44:23Z

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, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2026-02-02T18:44:23Z. The update package is 604.01 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 6af7c4bdd944dfdc2018b39e4c52786f5a78b5f7.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32108/DD189E92-60F9-43FF-BACD-F9B9909606BD/com_apple_MobileAsset_SoftwareUpdate/6af7c4bdd944dfdc2018b39e4c52786f5a78b5f7.zip