watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

550.21 MB

Release Date

2026-02-02T18:44:16Z

Update Type

Normal release

Delta update - requires 6.1.1 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 2026-02-02T18:44:16Z. The update package is 550.21 MB. This is a delta (partial) update that requires 6.1.1 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 3b88f594a3e5e0575f12ff65eed811ff882b7bd9.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-01519/5F2E59D4-5B08-4F3E-8A1A-AC4F4D9A8F92/com_apple_MobileAsset_SoftwareUpdate/3b88f594a3e5e0575f12ff65eed811ff882b7bd9.zip