watchOS 6.3.1

watchOS

Version

6.3.1

Build ID

17U224

File Size

165.87 MB

Release Date

2026-02-02T18:44:51Z

Update Type

Normal release

Delta update - requires 6.3 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 5 (40mm, LTE) →

About This Update

watchOS 6.3.1 (build 17U224) is an official Apple over-the-air update for the Apple Watch Series 5 (40mm, LTE), released on 2026-02-02T18:44:51Z. The update package is 165.87 MB. This is a delta (partial) update that requires 6.3 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 a9bad36cae63f36fdd1078850d163051b0ca17a3.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-01612/BE179121-5C9C-456E-8E40-E4DC2D722316/com_apple_MobileAsset_SoftwareUpdate/a9bad36cae63f36fdd1078850d163051b0ca17a3.zip