watchOS 5.1.3 (16S5535a) 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 7, 2019 Upload Date January 4, 2019 Filename 926638bd83a9b96b8209a2cd7f8dea8c4902f7af.zip Filesize 1.3 GiB Identifier Watch2,7
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