: Reading and setting Engineering Change Announcement (ECA) or rework numbers.
: Re-keys the 7-digit configuration code (e.g., 4401-CTO ) so internal drivers match layout matrices. Thinkpad Hardware Maintenance Diskette Version 1.76
Connect a floppy drive (internal or official IBM USB portable floppy drive) to the target ThinkPad. Power on the machine and press to access the Boot Menu. Select the floppy drive as the primary boot device. : Reading and setting Engineering Change Announcement (ECA)