watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

547.82 MB

Release Date

2026-02-02T18:44:06Z

Update Type

Normal release

Delta update - requires 6.1.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 2 (38mm) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2026-02-02T18:44:06Z. The update package is 547.82 MB. This is a delta (partial) update that requires 6.1.2 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 21537864c74dc6d2f8f38ba39667f5534df206e6.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-32170/7EF3DB01-03C0-4A67-B4AF-2F2A60DF8036/com_apple_MobileAsset_SoftwareUpdate/21537864c74dc6d2f8f38ba39667f5534df206e6.zip