watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

518.45 MB

Release Date

2026-02-02T18:44:17Z

Update Type

Normal release

Delta update - requires 6.2 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 2026-02-02T18:44:17Z. The update package is 518.45 MB. This is a delta (partial) update that requires 6.2 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 354d46bef1b982a2d440d994b256107d1a14580e.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32217/B55C2D76-8E7F-4ADB-A710-FDC59B30D35E/com_apple_MobileAsset_SoftwareUpdate/354d46bef1b982a2d440d994b256107d1a14580e.zip