Firmware Patching

The firmware payload is bit-flipped (~). The checksum is a simple case of "add up all the bytes and make sure it equals X"

Header

struct FujiFirmHeader {
    // Type of the firmware layout - shows parser how big MODEL_CODE_SIZE is
    unsigned int type;

    // Proprietary model ID code
    unsigned char code[MODEL_CODE_SIZE];

    // Printed as hex in the camera. X.X
    unsigned int version1;
    unsigned int version2;

    // File checksum
    unsigned int checksum;

    // Whether device is a lens or camera
    unsigned int device_type;
};