watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

189.27 MB

Release Date

2026-02-02T18:44:18Z

Update Type

Normal release

Delta update - requires 6.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (42mm) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2026-02-02T18:44:18Z. The update package is 189.27 MB. This is a delta (partial) update that requires 6.3 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 574b18b93950fddd9115241d372226bd79ac5f18.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32220/61C9163F-26B9-400F-9421-09652B34AC6D/com_apple_MobileAsset_SoftwareUpdate/574b18b93950fddd9115241d372226bd79ac5f18.zip