My watch won't restart after update

Hi

Try force restarting your watch: Press and hold both the side button and Digital Crown for around 10 seconds, until you see the Apple logo.

If that does not help, you will need to contact Apple Support or make a Genius Bar reservation with a view to having your watch repaired / replaced under warranty. If you contact Apple Support, mail-in service may be available:

https://www.apple.com/support/watch/contact/

"If you see the Apple logo .. during startup, and your Apple Watch appears to restart or never fully starts up, contact Apple Support"

If your Apple Watch doesn't respond or won't turn on - Apple Support