watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U6224

File Size

275.2 MB

Release Date

2026-02-02T18:44:12Z

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 2 (42mm) →

About This Update

watchOS 6.3.1 (build 17U6224) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2026-02-02T18:44:12Z. The update package is 275.2 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 a3b4791c6a31fcf993399952aff3457da852a0a7.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32195/34BFF372-48C2-4921-B5B6-DF83C48321E1/com_apple_MobileAsset_SoftwareUpdate/a3b4791c6a31fcf993399952aff3457da852a0a7.zip