watchOS 5.3 (16U5526f) for Apple Watch Series 1 (38mm) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
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Release Date May 15, 2019 Upload Date May 13, 2019 Filename 1526413f626940b78f8c28c4e9ac00e0655b02d1.zip Filesize 1.3 GiB Identifier Watch2,6
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