watchOS 4.3.1 (15T5535b) for Apple Watch Series 1 (42mm) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
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Release Date April 2, 2018 Upload Date March 29, 2018 Filename 27847e1304c17cd2168990f825a2e20bba39edeb.zip Filesize 1.1 GiB Identifier Watch2,7
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