If you have a (hard lock), the official and safest tool is Dell Technical Support .
In older models, removing the for 30 seconds would reset the BIOS to factory defaults. However, on almost all Dell laptops made in the last 10 years, the password is saved in non-volatile memory (EEPROM) . This means the password will remain even if the battery is removed or the power is cut. Safety Warning dell bios password reset tool download
: Restart your computer and enter the wrong BIOS password 3–5 times until an error code or "System Disabled" message appears. Contact Support Dell Technical Support If you have a (hard lock), the official