Bytelocker’s easy re-signing tool

Bytelocker's easy re-signing tool lets you easily decrypt, edit, re-encrypt and re-sign Borderlands 4 save files. Supports Steam and Epic ID, with automatic output and log functions. Simple GUI: select mode, select input folder, press start. Thanks to mi5hmash for sharing the original source code.

Bytelocker’s easy re-signing tool

✨ **Easily manage Borderlands 4 save files** ✨

This tool allows you to **decrypt, modify, re-encrypt and re-sign Borderlands 4 save files** in just a few clicks. The design is simple, self-contained, safe and easy to use.

---

🚀 Installation Guide

• **Download the latest version**
• Download the latest ZIP release package

• **Extract files**
• Unzip to any location, for example: `Desktop\Bytelocker's Simple Re-Signature Tool`

• **File Structure**
• `Bytelocker's Resigner.exe` - main program
• `output\` - automatically created output folder
• `logs\` - automatically created log folder

💡 **No need to install .NET framework, all dependencies are included**

---

🎮 How to use

1. Start the application

Double-click `Bytelocker's Resigner.exe` and you will see the main window with input settings, action buttons and live logs.

2. Select mode

Select what you want to do in the upper left corner:

• **Decrypt** → Convert `.sav` to `.yaml` (readable/editable)
• **Encryption** → Convert `.yaml` back to `.sav`
• **RESIGN** → Patches archive files with your own platform ID

3. Select platform ID

• **Steam** or **Epic** → choose the right platform
• **Original ID** → Paste your own account ID
• Click **Save Settings** to remember your ID next time

The ID preview will show what is being used, for example:

`Steam:76561198123456789`

`Epic:abcd1234-5678-90ef-ghij-1234567890ab`

4. Select input folder

• Click **Browse** to select the folder containing the `.sav` or `.yaml` file
• App only scans top-level folders (not subfolders)

5. Output location

Tools always write results to: `\output`

6. Start processing

• Click **START**
• Progress is shown as a counter (eg: `3/10`)
• Results are displayed in tabular form: ✅ Success or ❌ Failure
• Full details are also written to the log box

7. Logging and Troubleshooting

• Click **Open Log** to view the log file
• Use **Clear Log** to reset the live log box
• If a problem occurs, check `logs\YYYY-MM-DD.txt` for details

---

🌟 Workflow example

🔓 Decryption Edit

• Set the mode to **Decryption**
• Point to your archive folder
• The file will appear in `output\` in `.yaml` format

✏️Re-encrypt after editing

• Modify the `.yaml` file (character level, money, etc.)
• Switch mode to **Encryption**
• Input folder = YAML file you edited
• Output = playable `.sav` file

🔄 Re-sign to your account

• Set the mode to **Re-Signature**
• Enter your original ID and platform
• Process → Archive rebind to your account

---

🔍 Find platform ID

Steam - SteamID64

• Open **Steam** and click on your profile
• Copy the **URL** in the browser address bar
• Your SteamID64 is the long number at the end
• Paste into the **Original ID** box and select **Steam**

Epic Games - Account ID

• Log in to the Epic Games website
• Go to **Account → General**
• Scroll down to **Account Information**
• Your **Account ID** is a long alphanumeric string
• Copy and paste into the **Original ID** box and select **Epic**

💡 **Tip**: If you decrypt the archive first, the YAML file will also show an existing `platformid:` entry, which you can reuse or replace with your own ID.

---

🙏 Thanks

• **mi5hmash** - expose original source code
• **Bytelocker** - Rebuilding, simplifying and packaging tool