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IBM Thinkpad Bios Password

My IBM T23 Lost date and time and so on booting it will be bring the date and time error which prompts me in the bios. Unfortunatel the bios has a password which I dont know, I have tried the IBMpass software to read the eepron but have failed. I have also changed the chip storing the IBM passwords but have still failed. Any other means please?
Thanks.
Moses Lukato

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