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Because serial numbers are unknown, we do not have a manufacture date.The re-inspection of the returned devices revealed severe damages caused by strong external forces, i.E.Drop damages, in all cases.Three devices showed signs of manual opening of the housing and attempts to self-repair were visible.Additionally, all returned devices had penetration of fluid (e.G.Water) into the device housing, which led to corrosion and extensive damage to the internal circuit board.In summary, all devices had been returned with severe damages.No specific failure mode was identified and there was no material or manufacturing issue related to the returned devices.
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