watchOS 6.3.1 (17U224) for Apple Watch Series 4 (44mm, LTE) ✓ This OTA is 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 February 2, 2026 Upload Date January 28, 2026 Filename 9f2b91d0606994f29987303cf948749d5b44bf2d.zip Filesize 1.4 GiB Identifier Watch4,4
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