Been there - done that with my thinkpad x230. To remove supervisor password - just short circuit SDA and SCL legs on the EEPROM chip before entering the BIOS on startup Chip wherebouts: http://www.ja.axxs.net/x220.htm Instructions to follow: https://www.youtube.com/watch?v=ANZjUPUYE7s
Some '''disadvantages of locked BIOS''':
* you can't change boot device
* you are not able to enable Virtualization abilities of the CPU
* you couldn't turn off Anti-Theft and other security features