EFT Dongle samsung a750f root error

Opening Port COM25...........OK Verifying Download Mod
OK
Initialization.......OK
Reading Phone Partitation Table........OK
Partition Size : 8192
Unpak pit .......OK
FLASHING FIRMWARE TO PHONE.....
Writing: boot.img.......OK
FLASHING DONE!
Rebooting PDA TO NORMAL MODE......
ERROR : phone unable to accept data, wrong command sent..OK