If you are NOT using a firmware clearly marked as CHINA version, the Chinese utilities such as multi-cast tool will NOT work.
If you confirm that you are using a CHINA version firmware, you need a PATCH firmware such as "allshell4.bin" to flash using the multi-cast tool, rather than just use it alone.
Please provide me your email address and I will send you a PATCH firmware for shell, for you to take a shot.