watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

501.8 MB

Release Date

2026-03-24T18:36:07Z

Update Type

Normal release

Delta update - requires 5.0 installed first.

Download OTA

Looking for beta firmware? View beta builds for Apple Watch Series 4 (40mm) →

About This Update

watchOS 5.3.10 (build 16U711) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2026-03-24T18:36:07Z. The update package is 501.8 MB. This is a delta (partial) update that requires 5.0 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 1ebcf6aa5f1a1078c2088a50d7e89faad9f59580.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72997/BA5684E9-60C2-43E3-BFBC-8C1CF7693FF8/com_apple_MobileAsset_SoftwareUpdate/1ebcf6aa5f1a1078c2088a50d7e89faad9f59580.zip