watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

318.98 MB

Release Date

2026-02-02T18:44:53Z

Update Type

Normal release

Delta update - requires 6.2.1 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 5 (44mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 5 (44mm, LTE), released on 2026-02-02T18:44:53Z. The update package is 318.98 MB. This is a delta (partial) update that requires 6.2.1 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 f9a2c017a879046f4c5a4b428e1a6e1683be5052.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32214/464C0EEE-4203-4F0D-8E6A-4964DD186938/com_apple_MobileAsset_SoftwareUpdate/f9a2c017a879046f4c5a4b428e1a6e1683be5052.zip