This utility is intended for internal service use and is not typically listed on public consumer-facing Lenovo Support Direct Download (Official Source): You can often find it directly on Lenovo's file servers at
The utility allows users to modify critical system information stored in the EEPROM: System Identification : Updating the Serial Number Machine Type Model (MTM) Asset Tagging : Adding or updating asset ID data. Error Resolution
The Anatomy and Safety of System File Downloads: Analyzing "i7tm38us 1.90 version.exe"
: The CMOS settings are conflicting with the new firmware code. i7tm38us 1.90 version.exe download
i7tm38us.exe is the installer for version 1.90 ThinkPad Hardware Maintenance Diskette (HMD)
The i7tm38us.exe file (often found in version 1.90) is a . It is typically designed by Lenovo for specific, older generations of ThinkPad laptops to manage vital system-level information, specifically the EEPROM (Electrically Erasable Programmable Read-Only Memory) or BIOS/UEFI parameters. Primary Uses of this Utility:
What the package contains (typical)
. It was designed to ensure that even if the laptop was crushed, wiped, or left to rot in a landfill, a small partition of the BIOS would remain active, whispering its serial number into the background noise of the internet forever. The Download That Never Ends To download i7tm38us_1.90.exe
Executing the downloaded i7tm38us.exe on a computer does not write information directly to your current machine. Instead, it extracts the configuration files required to build a bootable environment. Step 1: Extract the Installation Package
The file is the official executable package for the Lenovo ThinkPad Hardware Maintenance Diskette (Version 1.90) . System administrators, IT technicians, and hardware enthusiasts use this utility to rewrite vital system identifiers—such as the System Serial Number, Machine Type Model (MTM), and System UUID —into a motherboard's EEPROM after a system board replacement. Without running this utility, a newly installed motherboard will trigger invalid configuration errors or exhibit missing serial numbers during a system boot. What is the i7tm38us 1.90 Version? This utility is intended for internal service use
Most .exe firmware flashers are Windows-native. Use wine (Linux) or a Windows virtual machine with passed-through USB devices. However, some low-level flash operations may fail. A dual-boot or dedicated Windows PC is safest.
The file is the official executable installer for version 1.90 of the Lenovo ThinkPad Hardware Maintenance Diskette (HMD) , a specialized tool used by technicians to write or update system identification data—such as the Serial Number (S/N), Machine Type Model (MTM), and System UUID —directly into a laptop's motherboard EEPROM. When a ThinkPad motherboard (system board) is replaced, the new board arrives blank from the factory, triggering an "Invalid Serial Number" or "2200: 2201: Machine Type and Serial Number are invalid" error message on bootup.
Running i7tm38us.exe on Windows simply extracts the core system files; it does not directly flash your BIOS from the desktop environment. You must use the extracted files to build a specialized DOS-bootable USB drive. It is typically designed by Lenovo for specific,
The prompt will request a device designation code; input or C0 depending on your generation prompt requirement.
| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | “Device not found” | Wrong driver or communication mode | Install USB-to-serial drivers (e.g., FTDI, CH340). Try a different USB port. | | “Checksum mismatch – File corrupt” | Download incomplete or tampered | Re-download from a trusted source. Compare file size with official specs. | | “Version 1.90 is not compatible with your hardware” | You have a revision B hardware, but the exe is for rev A | Locate the specific sub-model (e.g., i7tm38us-B ). Do not force flash. | | “Timeout during erase” | Poor connection or power fluctuation | Use a shielded USB cable. Disable power saving for USB ports in Windows. | | “Target firmware older than current” | You already have 2.00 or newer | Downgrading is rarely needed. Check release notes for rollback policy. |