If you have it voided (0x01(void)), then you can't unlock this phone using sever.
1. Power on the phone.
2. Type *#0808# and select 'DM+MODEM+ADB'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Press 'Read Codes via server' button, write your login and password in window if it will appear.
(Login and password will be saved as default after first input and can be changed in settings)
Operation: Read Codes via Server
Selected model: SM-G390W
Software version: 31.5.1
Checking Login and Password... OK
Ballance: 10 crd.
You have 10 credit(s) left. This operation takes 5 credits.Continue? Yes
Searching Samsung modem... detected COM127
Reading phone info...
Model: SM-G390W
AP version: G390WVLU1AQJ1
CSC version: G390WOYA1AQJ1
CP version: G390WVLU1AQJ1
Product code: GLW
Phone SN: R58J74G0B4T
IMEI: 357817080616754
Unique number: CQ300BDE1AA8754
Searching Samsung diag port... detected COM128
Reading phone info... OK
CP version: G390WVLU1AQJ1
CP build: Oct 26 2017 13:57:48
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... OK
Freeze code: 60641928
NET lock: 70858491
SUB lock: 00000000
SP lock: 00000000
CP lock: 00000000
SIM lock: 00000000
For check lock status: *#7465625#
Done with Samsung Tool PRO v.31.5.1
1. Power on the phone.
2. Type *#0808# and select 'DM+MODEM+ADB'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Press 'Read Codes via server' button, write your login and password in window if it will appear.
(Login and password will be saved as default after first input and can be changed in settings)
Operation: Read Codes via Server
Selected model: SM-G390W
Software version: 31.5.1
Checking Login and Password... OK
Ballance: 10 crd.
You have 10 credit(s) left. This operation takes 5 credits.Continue? Yes
Searching Samsung modem... detected COM127
Reading phone info...
Model: SM-G390W
AP version: G390WVLU1AQJ1
CSC version: G390WOYA1AQJ1
CP version: G390WVLU1AQJ1
Product code: GLW
Phone SN: R58J74G0B4T
IMEI: 357817080616754
Unique number: CQ300BDE1AA8754
Searching Samsung diag port... detected COM128
Reading phone info... OK
CP version: G390WVLU1AQJ1
CP build: Oct 26 2017 13:57:48
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... OK
Freeze code: 60641928
NET lock: 70858491
SUB lock: 00000000
SP lock: 00000000
CP lock: 00000000
SIM lock: 00000000
For check lock status: *#7465625#
Done with Samsung Tool PRO v.31.5.1