Position the Watch so you can easily access both the Digital Crown/Home and Side buttons, and then firmly hold the device in your hand.
Simultaneously press and hold both buttons for roughly 10 seconds, until the screen turns off and the Watch reboots.
Voila! You're good to go
Simple Way Any Apple Watch To Hard Reset After On Apple watch Any Iphone.
Again Update New Version.
Any Apple Watch Disable to Go Hard Resat .

See More: How to hard reset your Apple Watch