Any Inoi R7 users out there?

My Inoi seems to be dead. After normal usage and connecting to the power source, it’s no longer possible to turn on the device.

When connected to the power source the status led blinks (1s on, 1s off) - even when the battery is loaded externally (and seems to be fully loaded).

Is there some key press combination to reactivate the device?

Kind regards,
BGK