How To Remove Bios Password In Thinkpad T400S, T410S And T510S

As you know, in ThinkPad laptops, you should jump security chip pin 5 and 6 to remove Bios password.

Note: it might not work on some ThinkPad series, if so; I suggest you to remove security chip (IC), then password would be removed.
Note: number of security chip on motherboard is U77
IC: PCA24S08DP-T
The picture below is captured from its schematics.

 

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How To Unlock BIOS Supervisor Password From Lenovo Thinkpad W510/520/530 And T520

I demonstrated how to remove/clear BIOS supervisor password for lenovo thinkpad laptops. I have tested this method repeatedly to clear supervisor password of my personal thinkpad W520 and W510. I have been using these laptops since, with absolutely no problem.

Theoretically, this method should work on most of the Lenovo laptops. All you need to do is to find the location of EEPROM chip on your laptop (You can google it !).

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