The MP tool automatically picks the correct one based on the NAND ID. You rarely need to manually select the file, unless you are an advanced user.
: If your drive is not recognized, it may be in "ROM mode" (often showing VID: FFFF, PID: 1201 firstchip fc1178bc firmware
Never guess your controller model; trying to flash FirstChip firmware onto an Alcor, Silicon Motion, or Phison controller will completely brick the hardware. The MP tool automatically picks the correct one