I followed all of these steps and my watch won’t update
Cannot get the update to install. What else can I do?
Apple Watch Series 3, watchOS 6
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Have you tried doing a clean install? This would require that you wipe and re-pair the device to your phone. Then you can try doing the watchOS upgrade from the phone's Watch app:
https://support.apple.com/guide/watch/erase-apple-watch-apd4ad3571d9/watchos