An open-source Python-based suite designed to pack and unpack UF2 files. It provides a more versatile interface for managing the 512-byte blocks. 3. simonedegiacomi/files2uf2
The USB Flashing Format (UF2) is a popular file format developed by Microsoft for flashing microcontrollers over USB MSC (Mass Storage Class). Devices like the Raspberry Pi Pico, Arduino Nano RP2040 Connect, and Adafruit Feather use this format. While compiling code into a UF2 file is straightforward, reversing the process—decompiling or disassembling a UF2 file back into human-readable code—requires a specific set of tools and workflows. What is a UF2 File?
The above recovers raw binary. To actually (C-like pseudocode), integrate with:
: The official Raspberry Pi tool that can inspect UF2 files and provide information about the binary they contain. Hackaday.io Security and Ethical Considerations Reverse engineering UF2 files is a common practice for security audits firmware analysis uf2 decompiler
To clean up your decompiled code, focus on reconstructing these foundational elements:
A tool specifically designed to read a UF2 file and extract the files it contains. 4. Specialized Disassemblers (e.g., rp2040-disasm)
We will use , the open-source reverse engineering framework from the NSA. It’s free, powerful, and regularly updated. An open-source Python-based suite designed to pack and
are essential reverse-engineering tools used to translate compiled binary files back into readable source code or assembly language for microcontrollers [1]. The UF2 (USB Flashing Format) file format, originally developed by Microsoft for MakeCode, is widely used to flash firmware onto popular development boards like the Raspberry Pi Pico (RP2040/RP2350), Arduino, and Adafruit Feather.
Before utilizing advanced software, you must use Microsoft’s official Python utility to strip the UF2 container.
Once you have the .bin or .hex file, you need a reverse engineering tool capable of processing the specific CPU architecture of your target microcontroller. 1. Ghidra (Recommended) simonedegiacomi/files2uf2 The USB Flashing Format (UF2) is a
The compilation process strips away all variable names, function names, and comments. You will see generic labels like FUN_100003a4 or DAT_10001df0 . You must deduce their purposes by analyzing behavior and peripheral registers.
python3 uf2conv.py --convert --input your_firmware.uf2 --output output.bin Use code with caution.
A takes a .uf2 file and outputs: