Codex Patches Samsung Monitor Firmware to Add Custom Crosshair
manikfox · reddit · 2026-08-19
The author used OpenAI Codex to hack the firmware of a Samsung Odyssey G9 monitor, replacing the built-in crosshairs with a simple center dot.
Technical Details:
- Codex generated a minimal binary patch (13 bytes difference) based on Samsung's 1008.2 firmware.
- Version Spoofing: The version was changed to 1009.3 to trick the monitor into accepting it as an upgrade.
- Function Override: All six virtual aim options were redirected to a single 7x7-pixel center graphic already present in the firmware.
Outcome:
- The patched image passed checksum validation and was successfully flashed.
- The monitor now displays a hardware-layer center dot without requiring any software overlay on the PC.
Warning: Using unofficial firmware carries the risk of bricking the device.
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