Windows 10 Pwer on password not working

[narinesa]

Just purchased an HP probook laptop with 256GB SSD
Was using power on password.
Suddenly I see a message BIOS upgrade in process do not turn off computer.
After it finished, my password no longer works.
It is a 4 digit pin I used for many years other things so I cannot forget it.

I cannot power up the laptop and HP said that it is not under warranty.
How to fix this

 

[nmsuk]

reset the bios, by removing the cmos battery would be one way.

 

[narinesa]

ok will try. thanks