watchOS 5.3.10

watchOS

Version

5.3.10

Build ID

16U711

File Size

484.25 MB

Release Date

2026-03-24T18:36:08Z

Update Type

Normal release

Delta update - requires 5.1 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 2026-03-24T18:36:08Z. The update package is 484.25 MB. This is a delta (partial) update that requires 5.1 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 a5d8977ac9031ba6b4360cd718d2ed18741b0ae8.zip.

Direct URL

https://updates.cdn-apple.com/2025FallFCS/patches/047-72888/D3541A0B-7014-454D-B1F0-5D6489D0EABA/com_apple_MobileAsset_SoftwareUpdate/a5d8977ac9031ba6b4360cd718d2ed18741b0ae8.zip