Cannot update Apple Watch 3, model A1858
Apple Watch 3 Model A 1858 indicates not enough storage for recent update. Have taken everything off and have reset and paired as a "new" watch twice. Capacity shows 4.1 G
Apple Watch
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Try this;
Unpair your Apple Watch via the Watch app on your iPhone.
Then Re-pair your Apple Watch again,this usually frees up
enough storage space to update your watch.And without any loss of data.