so too, and I have had. Connect the Xperia into pc usb and wait for 15 minutes. Pull the battery and insert again, so a few times. You can also wake up the batteries, you must connect the batteries with the + and - to the battery (5.0 volts max.). If you have an old usb cable and cut it will have 4 wires, black and red you need to know to use red +, black -, connect the USB cable to the pc and connect the battery + to +, - to -. I did this and it works
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