Brokkr Flash

A modern, cross-platform Samsung device flashing utility written in C++23.

Features (why is it better than etc lol)

• Multi-device support: Flash multiple devices in parallel
• Wireless flashing support: Support for TCP-based flashing for Galaxy Watch
• Cross-platform: Native support for Windows, Linux, MacOS and Android
• Compressed download support; Samsung's Odin decompresses the lz4 stream before uploading no matter how recent is the device. We just send it compressed (if the device supports), allowing for up to 2x speed (depends on compression ratio).

Requirements

Build Requirements

• C++ Standard: C++23
• CMake: 3.22 or higher
• Build System: Ninja (or compatible)
• Compiler: MSVC (Windows) or GCC/Clang (Linux), Apple Clang (macOS)
• Threads: Standard library threading support

Runtime Requirements

• Windows: Windows 10 or later
• Linux: Any modern Linux distribution with USB support
• macOS: macOS 11 or later
• Android: Android 7.0 or later with USB host support

Building

On Windows

mkdir build
cd build
cmake .. -G Ninja
ninja

The compiled executable will be located at build/brokkr.exe

On Linux / macOS

mkdir build
cd build
cmake .. -G Ninja
ninja

The compiled executable will be located at build/brokkr

Linux Notes

USB device opened read-only

Brokkr needs read/write access to the Samsung USB device node (/dev/bus/usb/...). If your user only has read access, Brokkr will fail with UsbFsDevice: opened read-only and the GUI will show a popup asking you to reopen as root.

Two ways to fix it:

1. Quickest — run as root:

bash sudo ./<Executable>

1. Recommended — add a udev rule so your normal user can flash without sudo. Create /etc/udev/rules.d/51-brokkr-samsung.rules with:

# Samsung VID SUBSYSTEM=="usb", ATTR{idVendor}=="04e8", MODE="0660", GROUP="plugdev", TAG+="uaccess"

Then reload:

bash sudo udevadm control --reload-rules sudo udevadm trigger

Make sure your user is in the plugdev group (sudo usermod -aG plugdev $USER, then log out and back in). Replug the device after the rule is in place.

Wireless device not detected (firewall)

The wireless listener binds TCP port 13579 on 0.0.0.0. If your firewall blocks incoming connections, the connection won't happen.

For ufw:

sudo ufw allow 13579/tcp
sudo ufw reload

For firewalld:

sudo firewall-cmd --add-port=13579/tcp --permanent
sudo firewall-cmd --reload

For iptables:

sudo iptables -A INPUT -p tcp --dport 13579 -j ACCEPT

Both the host and the client must be on the same network (or at least be able to route TCP to each other on this port).

macOS Notes

"Brokkr can't be opened because the developer cannot be verified"

Brokkr is not notarized with Apple, so the system Gatekeeper will refuse to launch it on first run and may also tag it as "damaged" after download. This is not an actual problem with the binary — it's just the quarantine attribute Safari/Finder add to anything fetched from the internet.

To clear the attribute and allow the app to run:

sudo xattr -rd com.apple.quarantine <Path to brokkr app>

(Adjust the path to the .app.) After this, Brokkr launches normally and the warning will not return.

Alternatively, on the first launch attempt you can right-click the app, choose Open, and then click Open in the dialog — but the xattr command is faster and removes the warning permanently.

Android Notes

Not all devices are supported to be flashed in the Android version. For problematic devices, please use the Windows version instead.

License

This project is licensed under the GNU General Public License v3 - see the LICENSE file for details.

Copyright

Copyright (c) 2026 Gabriel2392

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Disclaimer

This tool is provided as-is for firmware flashing operations. Users assume full responsibility for:

• Obtaining legitimate firmware files
• Device compatibility
• Data loss or device damage
• Compliance with local laws and regulations

Flashing custom firmware may void device warranties and violate terms of service. Use at your own risk.

Dependencies

• Compiler: C++23-capable toolchain (recent GCC, Clang, or MSVC).
• CMake: 3.21 or newer.
• Qt 6.8.3 or newer

USB backends

• Linux: usbfs
• macOS: IOKit/IOUSBLib
• Windows: VCOM (like original Odin, same driver)
• Android: libusb (as of 2.4.5)

Telegram Community

• https://t.me/BrokkrCommunity