USING GHIDRA TO PATCH MY KEYBOARD'S FIRMWARE

Summary from the TLDR InfoSec newsletter

In this post, a researcher demonstrates firmware reverse engineering on the Epomaker Galaxy100 keyboard using Ghidra to bypass VIA configuration limitations and modify key mappings. The technical approach involved extracting firmware via DFU mode (Fn+L+Esc), setting up proper memory mapping in Ghidra for ARM Cortex-M3 architecture, locating USB HID keycode tables through pattern matching, and directly patching binary offsets to swap function key layers. Security professionals can apply these techniques for embedded device analysis, firmware modification workflows, and understanding how consumer hardware implements bootloader protections and keycode handling mechanisms.