watchOS 5.3 (16U5537b) 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 28, 2019 Upload Date May 23, 2019 Filename 32b6c4a0ca87ffadcb9c5a392625e3861d7c44a4.zip Filesize 1.3 GiB Identifier Watch4,1
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