Use uf2conv.py (part of microsoft/uf2 or makerdiary/uf2utils) to convert the file.uf2 to file.bin . python3 uf2conv.py -u input.uf2 output.bin Use code with caution. Note: The -u flag instructs it to u npack the file.
A "UF2 decompiler" is essentially a two-step process: converting the UF2 container back to a raw binary, and then disassembling that binary. While tools like uf2conv.py and picotool make extracting the binary easy, understanding the resulting machine code requires skills in assembly and reverse engineering.
A UF2 file is composed of a sequence of 512-byte blocks, each of which is independent and contains a specific piece of the puzzle. uf2 decompiler
The UF2 format is designed to be simple enough for a bootloader to parse and flash with as few as ~10 lines of C code. This straightforward structure is a double-edged sword: it makes for a reliable and simple flashing mechanism but also requires specialized tools to extract the embedded data.
To decompile a UF2 file, you must first understand how it packages data. Unlike standard raw binary images ( .bin ) or Intel Hex files ( .hex ), a UF2 file is an ordered collection of independent, 512-byte blocks. This specific size is intentional: it aligns perfectly with the standard sector size of a USB mass storage device, allowing the microcontroller’s bootloader to process blocks directly as they are written. Each 512-byte block contains a highly structured layout: Always 0x0A324655 ("UF2\n"). Magic Number 2 (4 bytes): Always 0x9E5D5157 . Use uf2conv
It can display the header information, including address, family ID, and block numbers. 2. raspberrypi/picotool
Variable names, function names, and comments are completely stripped away during compilation. You will see auto-generated names like FUN_100003a2 or local_28 . A "UF2 decompiler" is essentially a two-step process:
You will need Python installed. Then, clone or download the uf2conv.py script. git clone https://github.com/microsoft/uf2 cd uf2/utils Use code with caution. Step 2: Unpack the UF2 File