FIRST OF ALL DO THESE STEPS.....
YOU NEED Micro-Uart Cable
1. Phone must be powered on.
2. Type *#7284# and choose Modem for UART.
3. Type *#9090# and choose DM over UART.
4. Connect the phone to UART port.
5. Choose correct COM port in port settings
6. Press "Unlock" button.
SEE LOG
Selected model: N7105
Selected port: COM4 Z3X BOX Serial Port
Selected port speed: 115200
Reading phone info...
Build: M9XXXXXXCEHWMAZDXXXXXXX
Reading security... OK
Calculating... OK
Writing security... OK
Reseting...
Unlock done
Done with Samsung Tool v.15.8
YOU NEED Micro-Uart Cable
1. Phone must be powered on.
2. Type *#7284# and choose Modem for UART.
3. Type *#9090# and choose DM over UART.
4. Connect the phone to UART port.
5. Choose correct COM port in port settings
6. Press "Unlock" button.
SEE LOG
Selected model: N7105
Selected port: COM4 Z3X BOX Serial Port
Selected port speed: 115200
Reading phone info...
Build: M9XXXXXXCEHWMAZDXXXXXXX
Reading security... OK
Calculating... OK
Writing security... OK
Reseting...
Unlock done
Done with Samsung Tool v.15.8