Samsugn Z400 Unlock Done.. 
Selected model: Z400
Selected port: COM5 Z3X BOX Serial Port
Selected port speed: 115200
Searching Samsung modem... detected COM103
Reading phone info...
Model: SGH-Z400
Phone version: Z400ABFF1_FF4
IMEI: 359781000548828
Reading data from phone... OK
Calculating... OK
Checking phone at COM5 OK
Bypass MSL... OK
Unlocking... OK
Unlock done
Codes set to 00000000
Done with Samsung Tool v.19.1