watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

733.09 MB

Release Date

2026-02-02T18:44:22Z

Update Type

Normal release

Delta update - requires 6.0 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 2026-02-02T18:44:22Z. The update package is 733.09 MB. This is a delta (partial) update that requires 6.0 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 df32666e631fc2cd454ef0818c4d6f4a4362ecb0.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32202/3424FD60-9089-4DE6-94B9-9A293B8CD3A7/com_apple_MobileAsset_SoftwareUpdate/df32666e631fc2cd454ef0818c4d6f4a4362ecb0.zip