watchOS 5.1.3 (16S5531a) 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 December 19, 2018 Upload Date December 17, 2018 Filename c0215020e84367caf890374538a3aae9826a5e87.zip Filesize 1.3 GiB Identifier Watch2,7
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