I just replaced a system board on a Lenovo T410 Thinkpad. Type 2537. When running the maintenance disk (version 1.78) to change the serial number and system type on the system board I get the error message that the EEPROM is write protected. It suggests I restart holding the ESC key, etc. but when I do that, there isn't an option to unlock the EEPROM. Any suggestions on how to proceed will greatly be appreciated. I have tried scanning through other forums but no one seems to have a definite answer.