how to hack IBM Thinkpad Bios Password?

I lost my IBM ThinkPad Supervisor passwrd? I found electronic circuit to solve this problem but not clear you can refer to this link (http://sodoityourself.com/hacking-ibm-thinkpad-bios-password) the problem I don't know which kind of EEPROM I can you. so if you kindly guide to how to find it  out
paintcoAsked:
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Gary CaseConnect With a Mentor RetiredCommented:
Your best option is to use these folks:  http://www.pwcrack.com/security_chips_ibm.shtml

The specific chip for your R40 is here:  https://www.regnow.com/softsell/nph-softsell.cgi?items=1824-361
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nobusCommented:
hacking NOT allowed on EE
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