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For those comfortable with Node.js, is a "streaming" downloader and decryptor. It’s built to be fast and efficient, though it lacks a GUI. How to Find Your Firmware Details

The firmware downloads as an encrypted file ( .enc4 ). Samloader can decrypt this directly:

SamFirm Tool Linux: How to Download Samsung Firmware on Linux

Originally, SamFirm was a Windows-based tool that allowed users to download the latest stock firmware directly from Samsung servers by entering the model number (e.g., SM-G991B) and region (e.g., CSC code like BTU, TMB, or XAA).

Note: This method can be unstable because SamFirm relies heavily on specific Microsoft .NET cryptographic libraries. How to Flash the Downloaded Firmware on Linux

Your Linux system needs Wine along with the Mono package to handle the .NET dependencies of the Windows application. For Ubuntu/Debian systems: