Why is it not updating my watch
Why is the update not going on to my watch
Apple Watch Series 3, watchOS 6
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Is it a series 3 watch? If so, be patient. FWIW, a lot of people are having problems updating a series 3 due to lack of sufficient memory. For possible solutions, see the reply to:
Problem updating Apple Watch Series 3 to … - Apple Community
WatchOS 7.4 can't be updated on Watch Ser… - Apple Community
Series 3 watch only has 4.8 of memory - Apple Community