| Tool | Purpose | UF2 Support | |------|---------|--------------| | | Extract binary | Native | | uf2-family | Identify target MCU | Looks up family IDs | | Ghidra | Decompilation | Manual import of .bin | | IDA Pro (with UF2 loader script) | Disassembly & Decompilation (Hex-Rays) | Community scripts on GitHub | | Radare2 / Cutter | Command-line decompilation | r2 -a arm -b 16 firmware.bin | | BlackMagic UF2 Tool | Debug UF2 block integrity | Validate before decompile |
void reset_handler(void) uint32_t *src = &_sfixed; uint32_t *dst = &_data_start; while (dst < &_data_end) *dst++ = *src++; // ... call main()
The raw machine code or data destined for the microcontroller. uf2 decompiler
Every block begins and ends with specific 32-bit magic numbers ( 0x0A324655 and 0x0AB16F30 ) to prevent corruption during transfer.
Popular Wi-Fi and Bluetooth microcontrollers. | Tool | Purpose | UF2 Support |
The flags field in the UF2 header provides important metadata. The most common flag is 0x00002000 , which indicates that the Family ID field is present and valid. This ID identifies the microcontroller family (e.g., 0xe48bff56 for the Raspberry Pi RP2040, 0xada52840 for the nRF52840). The bootloader uses this ID to verify that the firmware is compatible with the device before flashing, preventing accidental bricking.
Developed by the NSA, Ghidra is the gold standard for open-source reverse engineering. Popular Wi-Fi and Bluetooth microcontrollers
For microcontrollers like the Raspberry Pi Pico (RP2040), the community has developed specific extraction tools. The picotool command-line utility can inspect and extract binaries directly: picotool save -f input.uf2 output.bin Use code with caution. Step 2: Choosing and Configuring Your Decompiler
Compilers aggressively rearrange, inline, and optimize code for speed and size. A simple for loop in C might be unrolled into a complex sequence of linear assembly instructions.
Inside src/main.c , we see:
Some commercial applications employ obfuscators that inject dead-end loops, break control flows, or encrypt critical strings within the flash payload to defeat reverse engineering attempts. Conclusion