6. Rotate the computer into Tablet mode and then follow the on-screen instructions to complete the
calibration process.
Note: You might need to rotate the LCD display in every aspect to ensure each YOGA mode works well.
Retaining serial numbers
This topic provides instructions on the following:
• “Restoring the serial number of the system unit” on page 63
• “Retaining the UUID” on page 64
Restoring the serial number of the system unit
When the computer was manufactured, the EEPROM on the system board was loaded with the serial
numbers of the system and all major components. These numbers need to remain the same throughout the
life of the computer.
If you replace the system board, you must restore the serial number of the system unit to its original value.
The serial number of the system unit is written on the label attached to the bottom of the computer.
If you cannot find the serial number of the system unit on the bottom of the computer, try the following
method to get the number:
Note: For Intel models, 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.
Chapter 7. FRU replacement notices 63
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