Unresponsive Coreink

[andrea-dandrea]

The screen bears the last content, which is the button test output from some months ago. The buttons are now unresponsive. The green led does not light up any more, just the red led when the USB is connected with power. When connected to the pc, I get an descriptor request error at the USB device and no com port is assigned, so I cannot burn a new firmware. I tried unconnecting the battery, getting no different result. Any hardware reset I might try? Is this coreink dead?