watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

560.72 MB

Release Date

2026-02-02T18:44:10Z

Update Type

Normal release

Delta update - requires 6.1 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 2026-02-02T18:44:10Z. The update package is 560.72 MB. This is a delta (partial) update that requires 6.1 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 99b20f4b86381eba9082910b9bbc607d26dd5f97.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-01678/4E0F9160-B6A7-44D0-9FAE-55FE82871F4A/com_apple_MobileAsset_SoftwareUpdate/99b20f4b86381eba9082910b9bbc607d26dd5f97.zip