Brand new laptop

If it's asking you for a password, it's not a "brand new laptop", it's used and the seller didn't set it up properly for resale.

Take it back to the seller and ask it be either fixed at his expense or the he replace it with what he claimed you bought.

Jdysuebdh wrote:

I got my new MacBook Pro today. Immediately after opening it updated the software but then prompted me for a password that I have never set up. It’s the firm meat thing I have done with it.

Bought from where...(?)

You can See if your Serial number is registered

My Support - Official Apple Support

I would suggest you Call Customer Support (800) MY–APPLE (800–692–7753)

or on line Apple Support

or call AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple for support and service - Apple Support