how to reset apple watch and pair again
How to reset apple watch and pair again after many attempts failed to unlock it
iPhone 7 Plus
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On a computer, go to iCloud.com and sign in with your Apple ID.
Go to Find Iphone.
Select All Devices, then click your Apple Watch.
Click Erase Apple Watch.
Select Next until the device is erased.
Click the remove button next to your Apple Watch.