1.820.3345.33

Uf2 Decompiler

| Offset | Size | Field | Description | |--------|------|-------|-------------| | 0x00 | 4 | magicStart0 | 0x0A324655 ("UF2\n") | | 0x04 | 4 | magicStart1 | 0x9E5D5157 | | 0x08 | 4 | flags | Bit 0x2000 = MD5_CHECKSUM (optional) | | 0x0C | 4 | targetAddr | Absolute flash address | | 0x10 | 4 | payloadSize | Usually 256 bytes (max 476) | | 0x14 | 4 | blockNo | Sequence number (0‑N) | | 0x18 | 4 | numBlocks | Total blocks in file | | 0x1C | 4 | familyID | MCU identifier (e.g., 0xE48BFF56 for RP2040) | | 0x20 | 476 | data | Firmware payload | | 0x1FC | 4 | magicEnd | 0x0AB16F30 |

Before starting the decompilation process, you must strip away the 512-byte UF2 block structures and assemble the payload bytes into a contiguous memory image.

| Offset | Size | Field | Description | |--------|------|-------|-------------| | 0x00 | 4 | magicStart0 | 0x0A324655 ("UF2\n") | | 0x04 | 4 | magicStart1 | 0x9E5D5157 | | 0x08 | 4 | flags | Bit 0x2000 = MD5_CHECKSUM (optional) | | 0x0C | 4 | targetAddr | Absolute flash address | | 0x10 | 4 | payloadSize | Usually 256 bytes (max 476) | | 0x14 | 4 | blockNo | Sequence number (0‑N) | | 0x18 | 4 | numBlocks | Total blocks in file | | 0x1C | 4 | familyID | MCU identifier (e.g., 0xE48BFF56 for RP2040) | | 0x20 | 476 | data | Firmware payload | | 0x1FC | 4 | magicEnd | 0x0AB16F30 |

Before starting the decompilation process, you must strip away the 512-byte UF2 block structures and assemble the payload bytes into a contiguous memory image.

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