ThinkPad T480s, Hardware Maintenance Manual

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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.
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T480s Hardware Maintenance Manual