What is bitfix?

bitfix is an open-source Lua-based runtime binary patcher originally developed by Truman Kilen (trumank).

It allows compatible Lua modifications to change certain game instructions while the game is running, without permanently modifying the original executable.

bitfix does not change gameplay by itself. It is a tool used by compatible mods.

Changes From the Original Project

This is a community-compiled distribution of trumank's original bitfix project, prepared and tested for Sword Art Online: Fatal Bullet.

No changes were made to the original source code or functionality.

The following work was performed for this release:

• Compiled the original bitfix source code using Rust 1.85.1.
• Prepared the compiled DLL as x3daudio1_7.dll for Fatal Bullet.
• Verified successful DLL initialization, Lua script loading, byte-pattern scanning, and Lua callback execution.
• Packaged the DLL, bitfix folder, and original MIT license.
• Added beginner-friendly installation instructions.

This release is intended to make the original bitfix tool easier for Fatal Bullet players to install and use.

Features

• Loads compatible Lua modifications.
• Supports game-code pattern scanning and runtime patches.
• Does not permanently modify the game's EXE.
• Allows individual Lua mods to be installed or removed separately.
• Does not require Rust or Visual Studio for ordinary users.

Installation

Step 1 — Find your game folder

In steam, users can right-click Sword Art Online: Fatal Bullet and select Manage → Browse local files.

Open:

SAOFB\Binaries\Win64

Step 2 — Install bitfix

1. Download and extract this project's ZIP.

2. Copy x3daudio1_7.dll into the Win64 folder.

3. Copy the bitfix folder into the same location.

Refer to the Installation Example image to verify installation was done correctly

Step 3 — Install compatible Lua mods

1. Download any mod(s) that specifically requires bitfix in the mod description when applicable.

2. Place its .lua file inside the bitfix folder.

3. Launch the game.

Example:

SAOFB\Binaries\Win64\bitfix\ExampleMod.lua

How to Check if bitfix Works

Launch Fatal Bullet, then check the Win64 folder for:

bitfix.txt

This log records initialization and Lua patch activity when bitfix loads.

If a particular mod isn't working, check the log and the mod's own installation instructions.

Uninstallation

1. Open SAOFB\Binaries\Win64.

2. Remove the x3daudio1_7.dll installed by this package.

3. Remove the bitfix folder if you no longer need its Lua mods.

Important Information

Back up your game saves before testing gameplay modifications.

Credits and License

Original Developer: Truman Kilen (trumank)

Original Source Code: https://github.com/trumank/bitfix

License: MIT

I am not the original developer of bitfix. This community build was compiled from trumank's original open-source project without modifying its source code. The complete original MIT license is included in the download.