watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

674.83 MB

Release Date

2026-02-02T18:44:37Z

Update Type

Normal release

Delta update - requires 6.0 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (40mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2026-02-02T18:44:37Z. The update package is 674.83 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 986a2da1e2909868021c1b9f050449d3d430dbe1.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32223/994310F5-BD5B-4A4C-9B2C-7A9CFA53C296/com_apple_MobileAsset_SoftwareUpdate/986a2da1e2909868021c1b9f050449d3d430dbe1.zip