watchOS 5.1.3 (16S5535a) for Apple Watch Series 1 (38mm) ✗ 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 778782ff0c298fdb8f06f9d1fecdd7f2319ca200.zip Filesize 1.3 GiB Identifier Watch2,6
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