watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U6224

File Size

274.36 MB

Release Date

2026-02-02T18:44:19Z

Update Type

Normal release

Delta update - requires 6.2.8 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 17U6224) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2026-02-02T18:44:19Z. The update package is 274.36 MB. This is a delta (partial) update that requires 6.2.8 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 54d00fe15166d8627f46b048f7a44ff4d6cb47d2.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32208/3EEBCBCA-3D92-4A2B-8F31-B3B90F064B4F/com_apple_MobileAsset_SoftwareUpdate/54d00fe15166d8627f46b048f7a44ff4d6cb47d2.zip