Blutter Termux Guide: Setup, Usage, and Updates 📱💻

Posted on Feb 12, 2024

Table of contents:

Blutter is a powerful tool for reverse engineering Flutter apps, and you can run it directly on your Android device using Termux. Here’s a complete guide on how to install, use, and update Blutter in Termux. Let’s dive in!

🎥 Video Guide:

While there are video guides available, they might not be very helpful due to being outdated:

But don’t worry, this text guide will get you up and running smoothly! 😄

🖥 Requirements:

Make sure you have the following installed in Termux:

pkg i -y git python

👉 Installation Steps:

Navigate to Home Directory:
```
cd $HOME
```

Clone the Blutter Repository:

git clone https://github.com/dedshit/blutter-termux.git

Install Dependencies:

pip install requests pyelftools
pkg install -y cmake ninja build-essential pkg-config libicu capstone fmt

Enter the Blutter Directory:
```
cd blutter-termux
```

✨ Usage:

Navigate to the Blutter Directory:
```
cd $HOME
pwd   # To check if you're in the correct directory
```
If you’re not in the Blutter directory, navigate there:
```
cd blutter-termux
```

Run Blutter:

python3 blutter.py path/to/app/lib/arm64-v8a out_dir

Or alternatively:

python blutter.py path/to/app/lib/arm64-v8a out_dir

🖥 Example Command:

For example, if you want to extract files from an app:

python3 blutter.py /storage/emulated/0/MT2/lib_edit/ /storage/emulated/0/MT2/lib_edit/blutter-output/

✨ Important Notes:

Enter Commands One by One:
- Press enter after each command.
Check Your Home Directory:
- Your $HOME directory in Termux should be:
```
   /data/data/com.termux/files/home
```
Fixing Errors:
- If you encounter errors related to no member named 'format' in namespace std, run the following command in the Blutter directory:
```
   find -type f -exec sed -i 's/std::format/fmt::format/g' {} +
```

👉 Updating Blutter:

Automatic Updates:
Every time you run blutter.py, it will automatically check for updates and apply them, including the necessary changes to std::format.
Manual Update (if needed): If Blutter isn’t updating or you’ve made manual changes, you might need to reset and pull the latest updates:
```
  git reset --hard && git pull
```

🥷 Extra: Handling Dart Dev Version Errors 🐛

If you’re dealing with Dart dev version between 3.0.0-30.dev and 3.0.0-51.dev, use the following update:

git clone https://github.com/AbhiTheModder/blutter-termux -b 3.0.0-XX.0.dev blutter-termux-dev

This will create a new directory named blutter-termux-dev in your Termux current directory, specifically for those Dart versions.

👷‍♂️ Quick Tip for Using (b)lutter:

If you’re dealing with Dart versions that share the same snapshots (like Dart 3.4.x), you can avoid recompiling Blutter by using the --dart-version flag. For instance:

--dart-version 3.4.1_android_arm64

This flag allows you to use a compiled version for other versions like 3.4.2 or 3.4.3 without needing to recompile! 😎

That’s it! You’re all set to use Blutter in Termux for your reverse engineering needs.

Happy reversing! 🔧💻