If the lock is on the Hard Drive (HDD/SSD) rather than the BIOS, a master password might reset the lock but wipe the data as a security measure.
Q: What happens if I forget the Dell 8FC8 master password and cannot access the device? A: Contact Dell support for assistance. They will guide you through the process of resetting or recovering the master password. dell 8fc8 master password
When entering the master password, be aware of your keyboard layout. The BIOS often defaults to a layout. If the lock is on the Hard Drive
After too many failed attempts, you see: dell 8fc8 master password
None of these work on modern BIOS (UEFI, Secure Boot, TPM-enabled) systems.