watchOS 5.1.3 (16S535) for Apple Watch Series 1 (42mm) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
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Release Date January 22, 2019 Upload Date January 11, 2019 Filename 15339af604e23c1c4cc8772c99d845d975d2cf31.zip Filesize 1.3 GiB Identifier Watch2,7
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