watchOS 5.3.3 (16U620) for Apple Watch Series 4 (40mm) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
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Release Date October 29, 2019 Upload Date October 17, 2019 Filename 13686c2f3e6bc077da5381abd9cbe446b0d6fa8b.zip Filesize 1.3 GiB Identifier Watch4,1
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