Lenovo ThinkPad X100e Hardware Maintenance Manual page 58

4. To write 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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Hardware Maintenance Manual