watchOS 5.1.3 (16S535) for Apple Watch Series 4 (44mm) ✗ 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 4394a0b744b81d99db5feb6b12a19cfe3c4d2e4f.zip Filesize 1.3 GiB Identifier Watch4,2
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