Error write root i9300

Please put the phone into Download Mode and connect USB cable.
To put GT-I9300 into Download Mode, You have to perform the following steps:
1. Reconnect the battery.
2. Press and hold "Volume-" + "Home" + "Power ON" keys.
3. When phone turns on, press "Volume+" key.
Found phone on
Firmware write started.
Please select firmware with PIT
Writing Firmware Failed
Performed by 2.2.6 software version