Below is a minimal but complete UF2 decompiler.
If you need to know a UF2 file, or need assistance setting up Ghidra for your specific microcontroller board, let me know! Bootloaders - ARM Programming - SparkFun Learn
What is your ? (e.g., fixing a bug, finding a password, learning?)
def uf2_to_bin(input_file, output_file): with open(input_file, 'rb') as f: data = f.read() uf2 decompiler
A true "UF2 decompiler" is typically a two-step process: first, the UF2 container into a raw binary, and second, decompiling that binary into high-level code . Because UF2 is a wrapper format for flashing microcontrollers like the Raspberry Pi Pico and Adafruit boards, you must strip away the UF2 headers before you can analyze the actual logic. 1. Unpacking the UF2 Container
To extract the raw data from a .uf2 file, you need a utility that can "unpack" it.
The vector table is usually at the start of the binary. Below is a minimal but complete UF2 decompiler
If you are looking to modify an existing UF2 file, could you tell me (e.g., adding a feature, disabling a pin)? microsoft/uf2: UF2 file format specification - GitHub
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What (e.g., RP2040, ESP32, STM32) is the UF2 file built for? Do you have access to the hardware's SVD file or datasheet? Share public link Unpacking the UF2 Container To extract the raw data from a
The tool parses the 512-byte blocks to extract the raw data payloads. It uses the address information in each block header to reconstruct a contiguous binary image ( .bin or .hex ).
UF2 decompiler in the traditional sense (turning a binary back into readable source code) does not exist as a single tool, but you can achieve this by the UF2 file into a binary and then using a disassembler 1. Unpack the UF2 File
Ghidra allows you to map a chip's hardware registers (like GPIO, PWM, and I2C) using System View Description (SVD) files, transforming abstract memory addresses into readable peripheral names. 3. IDA Pro / IDA Free (The Industry Gold Standard)
with open(output_file, 'wb') as out: # Seek to create file size if gaps exist (fill with 0xFF usually for flash) current_pos = 0 for addr in sorted_addrs: offset = addr - base_addr if offset > current_pos: out.write(b'\xFF' * (offset - current_pos)) # Fill gap