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It worked on T400 machine type 6474. Don`t worry to short PINs 5&6 even randomly after you enter the BIOS for the first time. Maybe one suggestion - when you enter the BIOS already but you can`t change nothing in PASSWORD menu try left/right arrow keys with the PINs shorted. Those settings should change to disable. Then i saved it by F10 clicking repeatedly with PINs in short. After reboot with PINs shorted 3 errors appeared and then stucked. Reboot again with short still holding - 2 errors and stuck. Then release the short and reboot and the password menu was accessible with all passwords disabled. It sounds complicated but as i said before, dont worry to experiment with the PINs SHORT (but only with 5&6) - This worked on T400