Updating Apple Watch Series 3 to the latest version
Updating I watch series 3 to the latest version
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Apple Watch Series 3, watchOS 8
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Hello Danieltheexplorer,
Unfortunately, I believe the last supported watchOS version for the Apple Watch Series 3 was watchOS 8. You can scroll to the bottom of - watchOS 10 Preview - Apple - and see the Apple Watch Series 3 is not supported for watchOS 10. However, I believe watchOS 9 also doesn't support the Apple Watch Series 3, but I could be mistaken.
If you'd like watchOS 10, you'd need to buy a newer model.
I hope this helps!