For Fujitsu-Siemens computers, master password can be calculated using the "locked code", also know as the password hash or the disable code. How will you get this code? Simply enter wrong password in the locked computer for three (3) times and you shall see the "disable code" or "lock code" like the 5-digit code in this screen shot:
In other older or newer models, the password hash or "disable code" is composed of a 5 x 4 hexadecimal digits like ABBA-BAAB-CCCC-DEED-BEEF or a 5 x 4 decimal digits like 1133-0321-1777-9111-1771. Lastly, other hash patterns for Fujitsu systems are those with 8-alphanumeric characters like D23DB91F or 8-letter combination like DEEDBEEF.
NOTE: 6x4 Hexadecimal Codes ARE NOT SUPPORTED.