watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

462.51 MB

Release Date

2026-03-24T18:34:15Z

Update Type

Normal release

Delta update - requires 5.1.2 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 1 (42mm) →

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2026-03-24T18:34:15Z. The update package is 462.51 MB. This is a delta (partial) update that requires 5.1.2 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 39b8457a8722a47d8934f82ff9dfbcfb5706183b.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72850/BC6D3525-EA7C-41B6-BC43-F4035E5E191B/com_apple_MobileAsset_SoftwareUpdate/39b8457a8722a47d8934f82ff9dfbcfb5706183b.zip