samsung s5260 flashing error


Selected firmware file: GT-S5260_FW_UNKN.oct
Please put the phone into Download Mode and connect USB cable.
To put GT-S5260 into Download Mode, You have to perform the following steps:
1. Reconnect the battery.
2. Press and hold "Volume UP" + "Call" + "Power" keys.
Searching for a phone. Please wait…
Found phone on COM28
Firmware write started.
Writing APPS section…
APPS section has been written successfully.
Writing RSRC1 section…
RSRC1 section has been written successfully.
Writing RSRC2 section…
RSRC2 section has been written successfully.
Writing FactoryFS section…
Formating FactoryFS partition…
Formating successfully compleated
FactoryFS section has been written successfully.
Writing CSC section…
Writing Firmware Failed