This article provides a deep dive into what this file likely is, how to source it safely, step-by-step installation instructions, troubleshooting common errors, and essential security precautions.

If you've recently replaced a motherboard on a Lenovo ThinkPad or are dealing with a "Bad Serial Number" or "Invalid UUID" error in your BIOS, you likely came across the file version 1.90. This utility, officially known as the Lenovo Hardware Maintenance Diskette (HMD) , is an essential but restricted tool used by technicians to program vital system information into a new motherboard's EEPROM. What is the i7tm38us Utility?

: While the executable can be unpacked in modern Windows environments, creating the actual bootable USB often requires a Windows 7 environment due to compatibility issues with the usbfmtpw formatting tool in Windows 10/11.

The file is the official executable for the Lenovo ThinkPad Hardware Maintenance Diskette (HMD) . System administrators and technicians use it to update critical BIOS identifiers—such as the System Serial Number (S/N) , Machine Type Model (MTM) , and UUID —following a motherboard replacement.

Enable "Legacy Boot" in your ThinkPad BIOS and disable "Secure Boot".

: The utility unpacks by default to C:\Drivers\Maintenance Diskette\i7tm38us , where users must follow the instructions in the install.txt file to create a bootable maintenance key.

BIOS updates modify the lowest level of software on your computer. Follow these precautions to prevent bricking your system: Prerequisites

: Once submitted, values like the Serial Number and MTM cannot be easily changed; incorrect input may require another motherboard replacement or advanced technical support.

First, let’s decode the filename. While i7tm38us is not a mainstream application name (like Chrome or Photoshop), pattern analysis suggests it belongs to one of two categories:

I7tm38us 1.90 Version.exe Download Upd

This article provides a deep dive into what this file likely is, how to source it safely, step-by-step installation instructions, troubleshooting common errors, and essential security precautions.

Enable "Legacy Boot" in your ThinkPad BIOS and disable "Secure Boot".

: The utility unpacks by default to C:\Drivers\Maintenance Diskette\i7tm38us , where users must follow the instructions in the install.txt file to create a bootable maintenance key.

BIOS updates modify the lowest level of software on your computer. Follow these precautions to prevent bricking your system: Prerequisites

: Once submitted, values like the Serial Number and MTM cannot be easily changed; incorrect input may require another motherboard replacement or advanced technical support.

First, let’s decode the filename. While i7tm38us is not a mainstream application name (like Chrome or Photoshop), pattern analysis suggests it belongs to one of two categories: