Fairdell HexCmp is a specialized utility frequently discussed on platforms like MHH AUTO for comparing, editing, and analyzing binary files at the byte level [1]. It is utilized by automotive technicians to verify ECU remaps and identify diagnostic trouble code (DTC) locations by comparing original and modified files, offering features like side-by-side comparison and synchronous scrolling [1]. For more information, visit the MHH AUTO forum. Share public link
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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.
: Allows direct modification of binary data with full Undo/Redo capabilities. Search Functionality Share public link This public link is valid
Whether you are an immobilizer specialist, a performance tuner, or a technician repairing airbag modules, Fairdell HexCmp remains a cornerstone utility in the digital automotive toolkit, ensuring that while cars get smarter, the tools to fix them remain practical, visual, and effective.
The software supports files up to 4 GB, making it suitable for large ECU dumps, flash files, and binary dumps from modern vehicles. Can’t copy the link right now
Comparing raw binary files (like ECU dumps, firmware, or binary data) byte-by-byte to identify even the smallest changes.