Lenovo 21HH003AGE Maintenance Manual page 64

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.
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ThinkPad T16 Gen 2 and ThinkPad P16s Gen 2 Hardware Maintenance Manual