Released by Fairdell Software, HexCmp (often referred to as HexCmp2) is celebrated for its lightweight nature and powerful visualization tools. Typically less than 1 MB in size, it runs on almost any Windows system and supports files up to a massive 4 GB. It can be run directly from a USB drive, making it a "portable" asset for technicians moving between different workstations.
MHH AUTO is a prominent online forum dedicated to automotive software, diagnostics, and chip tuning. It operates on a registration-only, often paid, membership model to maintain a community of professional technicians.
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Disclaimer: Using third-party software for ECU flashing and editing carries risks. Always back up your original data. Binary File Compare Utility
One MHH user, after sharing a cracked version, noted that the version ( in 2008) is considered the final "gold standard" because "basically 2.27 already works well" for what they need. This trust in a stable, non-bloated tool is rare in modern software.
The screen flickered green-on-black as Lena stared at the hex dump. Two files. Side by side. Fairdell HexCmp showed them in perfect binary parallelism — left column the original firmware from a 2026 Mercedes S-Class, right column the tweaked version circulating on MHH AUTO forums. Fairdell HexCmp full - MHH AUTO - Page 1
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Modern ECUs use checksums to verify the integrity of their software. If a tuner changes a byte to disable the immobilizer, the checksum becomes invalid, and the ECU will not start. Using HexCmp, a user can compare a "Working File" (engine runs) against a "Virgine File" (ECU locks) to locate the exact offset where the security logic is stored. Once the difference is identified, the data can be copied or corrected, and the checksum recalculated.
Read the EEPROM using a programmer (e.g., XPROG-Box, Orange5, or UPA-USB). Save two versions: Released by Fairdell Software, HexCmp (often referred to
Similarly, for airbag modules, users share "dumps" (binary readouts from the module's memory). A member on MHH AUTO shared "a very good and simple program for comparing airbag dumps and bin files," which turned out to be a version of HexCmp.
Custom configurations shared by forum members to optimize hex editing for specific ECU architectures (e.g., Bosch, Continental, or Delphi). Key Features of HexCmp for ECU Tuning