Type this master password into your locked screen, then hold the key and press Enter to unlock the system.
If Dell refuses to help (e.g., second-hand laptop with no receipt), you must physically reprogram the BIOS chip.
Press F2 repeatedly during boot up to open the settings panel.
There are a few methods to reset the BIOS password on your Dell Latitude 5520:
Dell laptops generate a unique or Service Tag suffix when a password is entered incorrectly. You can use this to generate a master reset code.
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Because this requires soldering and coding, it is not recommended for average users.
The user must contact Dell Support and provide this code along with proof of ownership. Dell then provides a one-time "master" or "release" code to unlock the system.
Once access is restored, navigate immediately to the BIOS settings ( F2 at boot) to secure the system correctly.