Flashing logo
Apple logo is flashing. Unpaired, tried force reset by holding 2 side buttons and even tried turning it off, can’t even do that.
Apple Watch Ultra
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You might have to press the side button and the Digital Crown for at more than 10 seconds, to force restart the Apple Watch.
If this does not work, contacting the official Apple Support about that, or visiting the nearest authorized Apple Service Provider or Apple Store, would be the next step. You can use the link on this Appel Watch Service page to start the process:
Apple Watch Service & Repair - Apple Support