If the internal voltage inside the StyleLight is to low when performing an upgrade this message is showed.

Try to switch USB port on the PC or if a USB hub is used try to connect StyleLight direct to the PC.
It could also be a problem with the USB cable. Try with another USB mini cable.

You could also try with powering the StyleLight from the OBD connector.
To do this first connect the StyleLight to the PC with USB cable and then connect it to the vehicle. After this run the upgrade process again.