Most modern laptops use a hash-based challenge-response system. When you (or a thief) set a BIOS password, the system stores a hash of that password in the CMOS memory or an EEPROM chip. Upon boot, it creates a unique (a checksum or hash of a hardware ID + a secret key). The technician then enters a "Master Password" derived from that code.

Type the provided code carefully, paying attention to upper/lower case. After typing the code, press twice. What to Do If the Generator Fails?

If the standard online generator doesn't work, it usually means your laptop model uses a newer, more complex security algorithm. In this case, you may need to try alternative methods: