More evidence that the faulty device is acting as if the internal SD card is not detected, I think: plugging the two devices to power (the good one with internal SD removed) produces the same sequence of noises coming from the A13 chip on both the good and the faulty e-reader (very subtle noises though, require a very quiet room to hear). The noises are very different and much louder when SD card is present on the good device.
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