did you get the firmware from this thread?
"Samsung S5230 Firmware Download - FREE
Here we go again! I just uploaded unbranded firmwares for S5230 Tocco lite / Star:
Samsung S5230 Star firmware S5230XEII2 Generic Open Europe Slav
Samsung S5230 Star firmware S5230XFIF2 Generic Open Europe East
Samsung S5230 Star firmware S5230XXIG4 Generic Open Europe Common.
Download latest Samsung S5230 firmware NOW.
I can't really help you as I am looking for a way to unlock my phone as well. Never done it before so do hope someone can shine a bit of light here.