This post is to report sucessfull unlock of Samsung SGH-I407 with Z3X Box, just root with any solution of your choice and for the rest let Z3X Box do the job selecting as model I8190. (This model is just an I8190 with another name )

Here is log:

Selected model: I8190
Selected port: COM4 Z3X BOX Serial Port
Selected port speed: 115200
Reading phone info...
Model: SAMSUNG-SGH-I407
Android version: 4.1.2
Product code: SGH2I407ZKAATT
Phone version: I407UCAMD1
PDA version: I407UCAMD1
CSC version: I407ATTAMD1
IMEI: 354901050193524
Phone S/N: R31D50YAGLT
Checking Super user right... true
Reading data from phone... OK
Now connect phone to UART cable
Checking phone at COM4 OK
Bypass MSL... OK
Unlocking... OK
Unlock done
Codes set to 00000000
Done with Samsung Tool v.16.8
If phone still asking for unlock code after reboot, just type 00000000.

Luck!