Tool comparison
Hex Editor Neo, from HHD Software, is a Windows binary editor engineered for performance on very large files, with unlimited undo/redo, fast search, and low memory overhead. It offers pattern and regular-expression searching, a structure viewer to overlay typed definitions on data, bookmarks, file comparison, and data operations such as fill, insert, and arithmetic. It can also disassemble code for several architectures in its higher editions. In ECU and firmware work it is used to open large reads, locate repeated map patterns, apply and track edits with a full history, and diff modified files against originals. Its combination of speed and structure awareness suits tuners and reverse engineers who work with sizeable memory images.
Ghidra is a free, open-source software reverse-engineering framework released by the U.S. National Security Agency. It provides a disassembler, an interactive decompiler that recovers C-like pseudocode, cross-references, scripting in Java and Python, and collaborative project support. It supports a broad set of processor architectures, including ones found in automotive ECUs such as PowerPC, and can be extended with SLEIGH processor definitions for others like Infineon TriCore. In ECU research it is used to disassemble and decompile firmware, understand control logic, locate map-access routines, checksum algorithms, and diagnostic/DTC handling, and to document memory layout. It is a heavyweight, expert-level tool for people building tuning solutions and understanding how an ECU actually computes, not an end-user remapping application.
Hex Editor Neo (Hex Editor / Reverse Engineering, HHD Software) and Ghidra (Hex Editor / Reverse Engineering, NSA (open source)) compete in the same space, so the choice comes down to coverage, workflow and price for your specific ECUs. Windows hex editor built for very large files, patterns and structures Free NSA reverse-engineering suite with decompiler for ECU firmware
Whichever you flash with, Softechpro Solutions auto-applies DPF/EGR/AdBlue/DTC-off modules and Stage patterns with automatic checksum correction across ~1,400 firmwares on Windows & macOS — the fast way to get the actual file edits done.
See SoftechproMore on Hex Editor Neo