With respect from the originator of this thread, i found out how to edit the serial number in the BIOS.
Go to IBM/Lenovo website and select upgrad BIOS.
Manually upgarde the BIOS by clicking on the options manually. DO NOT use automated machine detection.
During the BIOS upgrade, there are 2 options: edit BIOS or upgrade
Edit BIOS.
Copy serial number from sticker at the bottom of thinkpad and add it into the BIOS setting.
After editing, choose enter/ok.
Restart computer and check BIOS setting again. Should be there.
Done... (The above method is contributed by IBM Singapore tech support)




