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The option with a processor dump also seems to me the most probable. The book is not seen as a USB drive. Perhaps this is a typical malfunction of this model. The power switch is OK - when pressed for more than 15 seconds, the orange LED goes out, but the green one does not light up (when the USB charger is connected). I also noticed an interesting thing - I connected the charging via a USB tester and saw that the charge current was less than 50 milliamps ... It is fashionable to charge a discharged battery with such a current for a month and not get a result. Moreover, the charging process is interrupted after a few minutes and is no longer resumed (the book stayed connected all night, and the amount of current shown by the USB tester did not increase). I charged the battery with an external source to a voltage of 3.8 volts, but the behavior of the book did not change - after a few minutes, the charging process with a weak current is still interrupted (this is clearly visible on the tester screen) and the orange LED goes out. Further, the book does not consume anything from charging. If you reconnect the USB cable, everything repeats in the same way. It remains to try to heat the processor with a soldering hot air gun (there is a hot-air soldering station) and check the result. I don't think it will get worse...
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