watchOS 5.2.1 (16U5113a) 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 May 7, 2019 Upload Date May 4, 2019 Filename c303b6e7dd1075e4caf027c91ea1cd4d408eac12.zip Filesize 1.3 GiB Identifier Watch4,1
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