Fastboot mode don't work on my Acro S - Sony Xperia S, Acro S, Ion

Hi,
I can't get into fastboot mode on my Sony Acro S. I hold the volume up button and then insert the USB cable. The blue led light up and everything seams to be ok but after some seconds the led get dark and the phone shows the Sony logo. The computer recognize the phone and the device manager shows an unknown device but It disapear after a while...
Anyone that have seen this before and maybe have a solution?
//Robert

That means your computers system is unable to install essential fastboot drivers for your phone. Try alternative USB ports.
If still it doesn't work then try it on another system. Also have a look on this,
http://forum.xda-developers.com/showthread.php?t=2447319

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