I can't say that 2 out of 6 by default is an acceptable failure rate. This isn't my first rodeo with loose ends. I used to buy batches (old version) without bunk beds. Not sure why two of them didn't work. I confirmed they were dead by swapping the cards and power cords. It looks like I'm going back to the old tried and tested ones. I will not disassemble the device to send two back. Take my ambivalence as a gift.
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