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UNLOCK INSTRUCTIONS:
USB mode :
1. Power on phone.
2. Type *#197328640# -> common -> usb config -> Samsung mode
3. Connect phone to PC, install drivers if needed.
4. Press 'Unlock' button for direct unlock or 'Read codes' to read security codes.
Or you can 'Read User Lock' or 'Reset User Lock'.

Operation: Unlock
Selected model: GT-S8600
Software version: 25.5

Searching Samsung modem... detected COM138
Reading phone info... error

Done with Samsung Tool PRO v.25.5