watchOS 5.2.1 (16U5091b) 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 April 8, 2019 Upload Date April 4, 2019 Filename 694602c6fc574c77b61a0f45d9f54e79248497e9.zip Filesize 1.3 GiB Identifier Watch4,1
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