UF2 Report ---------- File: blink.uf2 Blocks: 32 Family: RP2040 (0xE48BFF56) Target range: 0x10000000 - 0x10002000 Binary size: 8192 bytes
The official Microsoft UF2 repository includes Python scripts (like uf2conv.py ) that can convert UF2 files back into regular binaries.
Entirely free, excellent decompilation engine, supports ARM Cortex-M, ESP32, and custom architecture plugins.
# UF2 Magic constants UF2_MAGIC_START0 = 0x0A324655 # "UF2\n" UF2_MAGIC_START1 = 0x9E5D5157 uf2 decompiler
Understanding how a pre-compiled .uf2 file works.
Once the .bin file is extracted, tools like pyTony/rp2040 allow for the disassembly of RP2040 code, turning binary data back into readable assembly code. How to Decompile a UF2 File (Step-by-Step)
attempts to turn that Assembly back into high-level code like C or C++. UF2 Report ---------- File: blink
[ UF2 File ] ---> ( Extraction Tool ) ---> [ Raw Binary / .bin ] ---> ( Decompiler ) ---> [ C-Like Pseudocode ] Step 1: Converting UF2 to Binary (.bin)
Despite these hurdles, UF2 decompilation is indispensable for: Malware Analysis:
| Tool | Purpose | How to Get It | | :--- | :--- | :--- | | | Official conversion tool to extract binary from UF2 | Included in Microsoft's uf2 GitHub repository | | uf2l | Alternative Rust tool for packing/unpacking and flashing | GitHub ( cbiffle/uf2l ) | | uf2utils | Python library for inspecting and extracting UF2 contents | PyPI ( pip install uf2utils ) | | Ghidra | Powerful, free decompiler for analyzing the extracted binary | GitHub ( NationalSecurityAgency/ghidra ) | | IDA Pro | Industry-standard commercial disassembler/decompiler | hex-rays.com | | UF2-IDA-Loader | Loads UF2 files directly into IDA Pro | GitHub ( kjcolley7/UF2-IDA-Loader ) | | SVD Files | Provide register maps to enhance decompiler output | Find them in your MCU vendor's SDK or on GitHub | Once the
UF2 files are a type of binary file used by the MicroPython and CircuitPython firmware for microcontrollers. These files contain compiled Python code that can be executed directly on the microcontroller. While UF2 files are designed to be executed on microcontrollers, there may be times when you want to inspect or modify the code contained within them. This is where a UF2 decompiler comes in.
In the world of embedded systems and microcontroller programming, convenience is king. The , pioneered by Microsoft for the MakeCode platform, has become a ubiquitous standard for dragging-and-dropping firmware onto devices like the Raspberry Pi RP2040, Adafruit nRF52 boards, ESP32-S2/S3, and many Arduino-compatible boards.
Use plugins like Ghidra-SVD . These scripts ingest System View Description (SVD) files directly from manufacturers, automatically renaming obscure MMIO addresses into readable register definitions throughout your decompiled layout.