: Turn on the laptop and enter a wrong password 3 times until an error code (often labeled as a "System Number" or "Hash Code") appears on the screen.
If you need legitimate help with a Dell Latitude 5520 locked by a BIOS password, here are safe, lawful alternatives you can pursue:
: Press Esc , then select Y or "Save and Exit" to confirm. Method 2: Resetting a Forgotten Password
There are two primary methods to reset the BIOS password on a Dell Latitude 5520:
Older laptops allowed you to remove the CMOS battery to wipe the password. The Latitude 5520 stores passwords in . Removing the battery usually fails.
If the above methods don't work, you can contact Dell support for assistance. Here's how: