Uf2 Decompiler

: A Java-based tool that can unpack UF2 files into their original components if they were packed as a filesystem. 2. Disassembling the Extracted Binary

def parse_uf2(uf2_path): blocks = [] with open(uf2_path, 'rb') as f: while True: block = f.read(512) if len(block) < 512: break magic0, magic1 = struct.unpack('<II', block[0:8]) if magic0 != UF2_MAGIC_START0 or magic1 != UF2_MAGIC_START1: continue # skip invalid padding flags, addr, psize, block_no, num_blocks, family = struct.unpack('<IIIIII', block[8:32]) magic_end = struct.unpack('<I', block[508:512])[0] if magic_end != UF2_MAGIC_END: continue data = block[32:32+psize] blocks.append( 'addr': addr, 'data': data, 'block_no': block_no, 'num_blocks': num_blocks, 'family': family ) return blocks uf2 decompiler

: This is the standard Python tool from Microsoft and Makerdiary . Use the command uf2conv.py current.uf2 --output current.bin to generate a raw binary. : A Java-based tool that can unpack UF2

Let's imagine we found a mysterious firmware.uf2 online. Use the command uf2conv

If you want full control or are auditing the file structure, writing a manual extractor is trivial given the known block size (512 bytes).