Lenovo 20AA000955 Hardware Maintenance Manual Download Page 73

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When you replace the system board, perform the following steps to create a new UUID for the system board
if the system board does not have a UUID:

Note:

Before you perform the operation, ensure that the UEFI/Legacy setting within the

Startup

menu in the

ThinkPad Setup program is set to

UEFI Only

1. Connect a USB memory key to the computer.

2. Go to

https://www.lenovo.com/maintenanceutilities

and follow the instructions on the screen to create a

Maintenance Key.

Note:

Only an authorized Lenovo service technician can access the above Web site.

3. Restart the computer.

4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface

is displayed.

5. Type 2 under

Enter the action desired

, then press Enter. The Auto UUID generation utility interface is

displayed.

6. Type y under

Change UUID. OK? [Y/N]

, then press Enter. A new UUID is created and written. If a valid

UUID already exists, it is not overwritten.

Reading or writing the ECA information

Information on Engineering Change Announcements (ECA) is stored in the EEPROM of the system board.
The electronic storage of this information simplifies the procedure to check if the ECA has been previously
applied to a machine. The machine does not need to be disassembled to check for the ECA application.

To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write
function on the LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key.

1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and

then restart the computer.

2. From the main menu, select

6. Set ECA Information

3. To read the ECA information, select

2. Read ECA/rework number from EEPROM

and follow the

instructions on the screen. To read the box build date, select

5. Read box build date from EEPROM

and follow the instruction on the screen.

After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's
application. Use the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance
Key to update the EEPROM.

Note:

Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed to be the

same as the machine type of the machine that had the ECA applied to it.

1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and

then restart the computer.

2. From the main menu, select

6. Set ECA Information

3. To write the ECA information, select

1. Write ECA/rework number from EEPROM

, and follow the

instructions on the screen. To write the box build date, select

4. Write box build date from EEPROM

and follow the instruction on the screen.

If the system board is being replaced, try to read the ECA information from the old system board and transfer
the information to the new system. If the system board is inoperable, this will not be possible.

Chapter 7

FRU replacement notices