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Thinkpad has a very powerful protection, and entering or trying to enter or access it multiple times will cause it to lock completely, and you will need to change the system board - in other words : you need a new heart or brain for it
because the code you post is for the EEPROM checksum is not correct
so, dumping it might be a solution if you don't have anything important to back up, and even if you did, Very hard to retrieve
There is a list of common backdoor passwords for BIOS locks here. If these do not work you may need to seek help at your local computer repair facility, as cracking these passwords is either extremely difficult, or involves dissasembling the machine.
You can use Ophcrack, an open source software. You don't need any access to Windows to be able to recover your lost passwords. Simply visit the site, download the free ISO image, burn it to a CD and boot from the CD. The Ophcrack program starts, locates the Windows user accounts, and proceeds to recover (crack) the passwords - all automatically.
Here is the link to download you ISO file to burn to a cd. http://downloads.sourceforge.net/ophcrack/ophcrack-xp-livecd-2.3.1.iso
Or use Another computer by installing the exe file and make a cd for your recovery: http://downloads.sourceforge.net/ophcrack/ophcrack-win32-installer-3.3.1.exe