watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

314.96 MB

Release Date

2026-02-02T18:44:11Z

Update Type

Normal release

Delta update - requires 6.2.5 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 17U224) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2026-02-02T18:44:11Z. The update package is 314.96 MB. This is a delta (partial) update that requires 6.2.5 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 27b4a738a0d862d7bdb63012981d8c680d1a88ac.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32157/738D03B1-DE77-43D5-9C14-8817536BC1D9/com_apple_MobileAsset_SoftwareUpdate/27b4a738a0d862d7bdb63012981d8c680d1a88ac.zip