Use a second device to visit BIOS Master Password Generator (bios-pw.org) and enter that system number.
You can download the Dell BIOS password reset tool version 2.0 from the following link:
You may see references online to a "Dell Password Disable Tool." It is important to understand what this is:
: Locate the PSWD jumper on the motherboard. Move it, boot once, then return it to the original position.