Need help unlocking bios password

Call Dell support with verification of ownership of the system.

If you've forgotten the administrator password, you'll have to contact Dell support for a release code. You can view more information on the page below.

https://www.dell.com/support/kbdoc/en-us/000131024/how-to-clear-the-bios-password

For Windows, use this guide here:

https://support.microsoft.com/en-us/windows/change-or-reset-your-microsoft-account-password-in-windows-8271d17c-9f9e-443f-835a-8318c8f68b9c