The software is exceptionally lightweight, with an executable file size of just and compatibility stretching from Windows 95 and NT4 to Windows 11. This low footprint ensures it runs smoothly even on older workshop laptops.
The killer feature. When comparing an original ECU dump and a modified one (e.g., a stage 1 tune), HexCmp shows exactly which bytes changed. This is invaluable for understanding what tuning software actually does under the hood.
When comparing two files, the software locks the scrolls together. If you find a map change in one file, the corresponding address in the second file is displayed immediately alongside it.
In the world of ECU tuning, "Bin files" (binary dumps extracted from vehicle memory chips) are frequently compared. Fairdell HexCmp full - MHH AUTO - Page 1
For the average user on "Page 1" of the MHH AUTO forums, HexCmp is not just a file viewer; it is a surgical instrument.
The "full" version handles files up to 4GB+ without crashing. Modern ECUs (Bosch EDC17, MED17, Simos) have large flash dumps; HexCmp handles them smoothly.
In a thread titled "MHH AUTO Full Version: Toyota file," a member asks if downgrading a calibration file will produce a "big different numbers WHEN I CHECK WITH hexCMP". He is not just checking text; he is verifying critical safety and security bytes, ensuring the immobilizer does not lock the engine. When comparing an original ECU dump and a modified one (e
Once verified, the modified file is written back to the vehicle. Cybersecurity and Software Integrity Notice
Automotive programmers favor HexCmp over generic hex editors due to several specific features:
This review will dissect as it is presented and utilized within the MHH AUTO ecosystem, analyzing its features, usability, and why it remains a cult classic despite newer alternatives. If you find a map change in one
The software displays detailed metrics, including file sizes, exact offset addresses, and byte values in hexadecimal, decimal, and ASCII formats.
The reputation of Fairdell HexCmp within the MHH AUTO and broader auto-tuning community is overwhelmingly positive, built on its reliability and ease of use. Members frequently recommend HexCmp when someone needs a user-friendly software for comparing and editing binary files after reading a chip. One user, after being directed to HexCmp, simply replied, "installed hexcmp2. all good". This highlights the software's straightforward installation and user-friendly operation.
