Dmifit Tool And Hpbq138.exe May 2026

Feature Name: Auto-Serial Restore & Integrity Verification Target Environment: HP BIOS Configuration Utility (BCU) / DMIFIT Environment Component Interaction: DMIFIT.exe (Wrapper), HPBQ138.EXE (Driver/Module)

Cause: The DMI region is completely wiped or the CMOS battery is dead.
Fix: Replace the CMOS battery and retry. If that fails, use option 3 (Restore default DMI) in HPBQ138.EXE.

Here is the workflow a technician would use:

You cannot use one without the other on certain models. If you run only HPBQ138, your PC might boot but show "Unknown System" or "Serial Number: None" in diagnostic tools. DMIFIT tool and HPBQ138.EXE

Using DMIFIT, the (t_50) values ranged from 180–950 s, yielding (c_h = 1.2 \times 10^-6 \text to 8.7 \times 10^-6 \text m^2/\texts). HPBQ138.EXE produced (c_h) values 15–20% lower due to its assumption of full penetration before dissipation (no partial drainage correction).

HPBQ138.EXE does not run effectively in a Windows Command Prompt. It requires the NTVDM (NT Virtual DOS Machine) support, which was deprecated in 64-bit versions of Windows, or a native DOS environment (bootable USB).

If DMIFIT is the general-purpose tool, HPBQ138.EXE is the "master key." You cannot use one without the other on certain models

This is a specific, proprietary binary file designed for a narrow range of HP desktop motherboards (often based on Intel i810/i815 chipsets). The "BQ" in the filename typically refers to a specific BIOS family (e.g., HP Vectra VL400 or HP e-PC).

At the DOS prompt (C:\> or A:\>), type:

WRITEDMI.BAT

Or if a specific script doesn’t exist, run: Or if a specific script doesn’t exist, run: DMIFIT

DMIFIT.EXE /I

This shows current DMI data.

To write new data, use:

DMIFIT.EXE /W /S YOUR_SERIAL /PN PRODUCT_NUMBER /SKU SKU_NUMBER

Replace YOUR_SERIAL, PRODUCT_NUMBER, etc., with actual values from your HP label.

If HPBQ138 includes a preconfigured .BIN file:

DMIFIT.EXE /F BQ138.BIN /S SN12345678 /P "HP EliteBook 840 G5"

When the command to write is confirmed, the tool loads HPBQ138.EXE (or a similar version depending on the board model). The screen typically flashes or shows a progress bar.