watchOS 4.3.1 (15T5545b) 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 April 16, 2018 Upload Date April 12, 2018 Filename bb4d686414a166f48d1d3917ec40482a51e98581.zip Filesize 1.1 GiB Identifier Watch2,6
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