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