1. Power on phone.
2. Type *#197328640# -> common -> usb config -> Samsung mode
3. Connect USB cable, setup drivers.
4. Choise unlock method: Read codes.
5. Press Unlock SP button.
Searching USB Device... detected (COM12)
Reading Phone Info... OK
Model: GT-S8300
Factory SW: S8300NSxxx
CountryCode: DRE
UniqueNumber: 80190000398xxx
MemoryPhone: K5R2G1GACC(S8300)S
SW: S8300NSID1
IMEI: 35627603352xxx/x
Reading SysInfo... OK
Searching server... OK
Calculating codes... OK (time - 00:01:16)
Freeze code: 17286041
NET lock: #7465625*638*86357351#
Sub lock: #7465625*782*00000000#
SP lock: #7465625*77*00000000#
CP lock: #7465625*27*00000000#
Multi lock: #7465625*685*12369874#
SIM lock: #7465625*746*12369874#
For check lock status: *#7465625#
Done with Samsung 3G tool ver 9.4