Hi there, I'm from vietnam,I got a problem about my new phone EF81.I set password for phone code and master code but I don't remember, when I turn off and then turn on, it asks me the phone cold, I don't know, it asks about the mastercode, I can't use it. Please help me to repair, I don't know about mobile, so Please help me in the easies way that don't touch the mainboard, only in computer or the EF81. please write clearly. my IMEI is 358981002600707. thanks all