1)you can find a USB cable with zero, ask him
2)there is a software for the phone I think, check Samsung Japan website
3)most likely you are going to have to ship the phone to Hong Kong so they can unlock it for you , again ask zero.
4)you can't unlock it with that box unless you know how to boot the phone in recovery and can modify memory partitions or system files. SOFTBANK Os is proprietary unlike moap-l or s from docomo that are based on a public os but is not open for development.
Sent from my SH-12C using HowardForums