Here are the tools for updating your Lenovo machine’s BIOS settings and BIOS password. Please note the password cannot be set using this method when one does not already exist. Passwords can only be updated or cleared.
ThinkPad Models:
http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-68488
ThinkCentre M58:
http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-73098
ThinkCentre M90:
http://support.lenovo.com/en_US/downloads/detail.page?&LegacyDocID=MIGR-75407
ThinkCentre M91:
http://support.lenovo.com/en_US/downloads/detail.page?DocID=UM010121
ThinkCentre M92:
http://support.lenovo.com/en_NZ/downloads/detail.page?DocID=UM015241
What have I done today? 