watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

260.86 MB

Release Date

2026-02-02T18:44:42Z

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 4 (44mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2026-02-02T18:44:42Z. The update package is 260.86 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 7b32542ce33a8cafed4560f4eda864cd19608494.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32200/772FE050-530C-496A-8BEC-007B995617D0/com_apple_MobileAsset_SoftwareUpdate/7b32542ce33a8cafed4560f4eda864cd19608494.zip