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Can you access storage over USB cable?
At the top of visible USB storage, alongside /documents, create the file named:
DO_FACTORY_RESTORE
All capitals, no extension, no contents.
Remove USB cable.
Use a long press and hold of the power button to reboot the device.
If it seems to 'hang' while it is rebooting, hook it to a wall charger and just wait.
It will be trying to fix internal filesystem errors and could take days, even a week or two to complete and it must not run out of power during the process.
It the books reappear after that, presume hardware failure of the eMMC device.
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