How to unpair Apple Watch without phone and password?
How to unlock and unpair Apple Watch without phone and password?
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To unpair the watch without the iPhone, see the "How to erase your Apple Watch if you don't have your iPhone" section in:
Unpair and erase your Apple Watch - Apple Support
In any case you will need the password to unlock and unpair the watch. Activation Lock is an anti-theft feature that cannot be bypassed.
About Activation Lock on your Apple Watch - Apple Support