Device: Sony Xperia SP C5303.

I turned off the device, then hold volume up key, and plugged the USB cable. But I see no blue light. After a while it goes into charge mode.

What could be the problem?

Some additional information:

I'm on Windows 7, 64 bit. I downloaded this driver http://developer.sonymobile.com/downloads/drivers/fastboot-driver/ and overwrote the one in


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