watchOS 5.2.1 (16U5079d) for Apple Watch Series 4 (40mm, LTE) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
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Release Date March 28, 2019 Upload Date March 21, 2019 Filename a12df5c573cdba466991aa5ae0f0ecb3563bff5e.zip Filesize 1.4 GiB Identifier Watch4,3
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