Have you tried a soft reset on that device?
Soft reset with hardware keys
A soft reset is a simulated battery removal. This is used to power a device off when the screen is frozen or unresponsive and the device it has an internal battery that cannot be removed. It does not cause loss of personal data on the device.
# Press and hold the '''Power''' and '''Volume down''' key for up to 45 seconds.
# The device will restart and complete the soft reset.