You can reboot the CORE 500™ if the device is stalled, unresponsive, stuck in a reboot loop, or is otherwise unusable.
A hard reboot means disconnecting power from the device and rebooting it. It doesn't mean a factory reset, which returns the device to the out-of-the-box state.
To reboot the device:
Press and hold the top button for about 10 seconds, or until the screen turns off.
The screen turns off when the hard reboot is triggered.
Release the top button. The device reboots and shows the splash screen followed by the resting state screen, with the audio filter you last selected.