How to unlock bios


I have dell inspiron 15  3542. I want to change boot setting but cannot able to change setting before unlock bios. When start up windows it's required system password and i know the password but when i enter the password to unlock bios it show invalid password. How to unlock bios or clear bios password ? Thank you

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RE: How to unlock bios

You'll need to call Dell by phone with verification of ownership of your system.

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