Hi Samson,
I'm sorry for delay replying!
the attached is a updater for USB-Multilink which contains a .584 version firmware, I would suggest install it in your PC to update the Multilink firmware.
and I remember, CW v10.5 and CW v10.6 both has newer firmware, after updating to 584 firmware, CW will also update the firmware again when debugging.
please let me know if it helps!