watchOS 6.3

watchOS

Version

6.3

Build ID

17U216

File Size

557.02 MB

Release Date

2021-01-26T18:26:48Z

Update Type

Normal release

Delta update - requires 6.0 installed first.

Download OTA

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

About This Update

watchOS 6.3 (build 17U216) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2021-01-26T18:26:48Z. The update package is 557.02 MB. This is a delta (partial) update that requires 6.0 to already be installed on the device - it cannot be applied from scratch. This update is no longer signed by Apple, meaning it can no longer be downloaded and applied on-device through Settings.

The OTA payload file is b2bc245346b87728ece7646486c7dc6f9a4770c4.zip.

Direct URL

http://updates-http.cdn-apple.com/2021WinterFCS/patches/001-88796/C4E34A64-BDBA-45B7-97F4-7C0E6D8801D4/com_apple_MobileAsset_SoftwareUpdate/b2bc245346b87728ece7646486c7dc6f9a4770c4.zip