Power on your Latitude 3380 and press F2 to enter the BIOS. When prompted for a password, enter an incorrect one 3 times.

Use a secondary device to visit a reputable recovery site like bios-pw.org . Enter your 11-character alphanumeric system number exactly as it appears.

Enter the current password, leave the "New Password" fields , and press Enter again to clear it. How to Reset, Remove, or Recover BIOS Passwords | Dell US