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Stopped working completely!

My vivosmart 4 has stopped working completely. It has gone completely black. Two days ago it stopped working for about 11 hours then started again without requiring a charge. Yesterday it blacked out again. I put it on charge and it fired up for a little then started showing a strange screen with the time showing in a different format. It then showed a little bar like it was updating firmware. I charged it until it was full and then put it on overnight. When I woke up this morning it was completely black again. It is only just over a year old - so out of warranty by a few days. Is there anything that can be done to fix it or is it completely kaput?