A Dell BIOS Password Unlock Key Hint Number is a unique system-generated alphanumeric code (often called an or Error Code ) that appears after entering an incorrect BIOS password multiple times . This code is essential for obtaining a Master Password or Password Release Code to regain access to the computer. How to Find the Unlock Key Hint Number To generate this number on a locked Dell system: Turn on the computer and wait for the BIOS password prompt. Enter a wrong password three to five times consecutively.