watchOS 5.1 (16R5589c) for Apple Watch Series 4 (44mm, LTE) ✗ This OTA is not signed. OTA firmwares cannot be restored to. IPSW Downloads collects them for
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Release Date October 22, 2018 Upload Date October 19, 2018 Filename df3e6b2da5a5622d39e94d5dd0884a7ddda7fb89.zip Filesize 1.4 GiB Identifier Watch4,4
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