Many aftermarket cables labeled "for Kenwood/Baofeng UV-5R" will work, but you may need a with a built-in level shifter (MAX232) because the SMP468’s bus voltage is TTL (0–5V), not RS-232.
: A USB-to-serial cable with a 2-pin micro jack or the RKN4155 cable (common for business series) is required. motorola smp 468 programming software