watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

486.47 MB

Release Date

2026-03-24T18:36:59Z

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 4 (44mm, LTE) →

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2026-03-24T18:36:59Z. The update package is 486.47 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 d26aa262137ff08518a89943676128da66cb2b27.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72871/A91E9E61-F35C-4F6A-9C41-CA26E5B1B090/com_apple_MobileAsset_SoftwareUpdate/d26aa262137ff08518a89943676128da66cb2b27.zip