Flashtool sony xperia go

Eh ovako skino sam sa neta stock firmware za moju sony xperai go(st27i) i sad kad ubacim da se flashuje i sve uradim kako trba iskljucim mob,press volume down key i konektujem racunar i mob preko usb izbaci mi ovo kad krene da flashuje:

11/056/2014 15:56:20 - INFO - Connected device : Sony Xperia GO
11/056/2014 15:56:20 - INFO - Installed version of busybox : N/A
11/056/2014 15:56:20 - INFO - Android version : 4.1.2 / kernel version : 3.0.8+ / Build number : 6.2.A.1.100
11/057/2014 15:57:43 - INFO - Selected Bundle for Xperia Go ST27i. FW release : 6.1.1.B.1.1.0. Customization : Sony
11/057/2014 15:57:43 - INFO - Preparing files for flashing
11/059/2014 15:59:46 - INFO - Please connect your device into flashmode.
11/000/2014 16:00:03 - INFO - Device disconnected
11/000/2014 16:00:29 - INFO - Opening device for R/W
11/000/2014 16:00:29 - INFO - Start Flashing
11/000/2014 16:00:29 - INFO - Processing loader.sin
11/000/2014 16:00:29 - INFO - Checking header
11/000/2014 16:00:29 - ERROR - Processing of loader.sin finished with errors.
11/000/2014 16:00:29 - INFO - Ending flash session
11/000/2014 16:00:29 - ERROR -
11/000/2014 16:00:29 - ERROR - Error flashing. Aborted
11/000/2014 16:00:29 - ERROR - Drivers need to be installed for connected device.
11/000/2014 16:00:29 - ERROR - You can find them in the drivers folder of Flashtool.
11/000/2014 16:00:38 - INFO - Device disconnected

nemas drivere od mobitela.
Ugasi mob, konektuj usb, udji u download mode, pocet ce ti instalaciju. Upali mob, konektuj usb, pusti da se sve instalira i onda pocnes fleshovanje

Kako da udjem u download mode?