watchOS 6.3 (17U216) for Apple Watch Series 4 (40mm, LTE) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
potential future use. They might also be useful if you're doing research.
Release Date January 26, 2021 Upload Date January 14, 2021 Filename e0644bfb51965889e419741ed70dc6bfa8736e54.zip Filesize 1.4 GiB Identifier Watch4,3
All information on these pages is automatically updated. When you click on any Apple Software link on
the site, you are redirected to an Apple server. We do not (and never will) mirror these files. All trademarks are the property of their respective owners. IPSW Downloads is not affiliated with Apple Inc.
© 2026 IPSW Downloads
This page was last modified at 1:25:33 pm UTC on Monday, April 6, 2026 and built at 10:20:09 am UTC on Sunday, April 19, 2026.