This does NOT clear the Supervisor/BIOS password (also called SVP). That requires different hardware tricks (shorting SDA/SCL lines). HMD 1.76 is for the user power-on password only.
When updating the serial number, the utility requires a specific 20-character string format: : 1STTTTMMMMCCSSSSSSSS 1S : Required prefix. TTTT : 4-digit Machine Type (e.g., 2325 ). MMMM : 4-digit Model Type. CC : Country Code. SSSSSSSS : The unique Serial Number. Compatibility and Versions Thinkpad Hardware Maintenance Diskette Version 1.76
: Clearing "Invalid Serial Number" or "(INVALID)" alerts that appear in the BIOS after hardware repairs. This does NOT clear the Supervisor/BIOS password (also
: Reading or deleting existing S/N data and ECA (Engineering Change Announcement) information. Maintenance Utilities Thinkpad Hardware Maintenance Diskette Version 1.76