how disable bios password once set in 4 yr old pavilion?

HP laptop, won't boot, corrupted system file, etc.
Hitting F2 goes to bios, but the password screen launches.
The owner does not recall setting a password and the
one she uses for all her other things, doesn't work.
So, how do you turn that off in a laptop so you can
get to the bios?
In a pc I know you can clear the bios with a jumper
pin, but I have no idea how to proceed with a laptop.

TIA

mike


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