watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

485.85 MB

Release Date

2026-03-24T18:37:00Z

Update Type

Normal release

Delta update - requires 5.1.3 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 2026-03-24T18:37:00Z. The update package is 485.85 MB. This is a delta (partial) update that requires 5.1.3 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 f3e85f874e5a9e6bdf0f3b6d7c1c5c3291b0a587.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72955/4A54BBE2-708C-4219-B7EB-51034A69BF79/com_apple_MobileAsset_SoftwareUpdate/f3e85f874e5a9e6bdf0f3b6d7c1c5c3291b0a587.zip