It's a broken glass substrate, nothing you or anyone can do about it.
The crack is along the left side of the book title, clearly visible.
Sell it on Ebay, maybe someone needs it for spare parts.
Quote:
The PC does not recognize it (does nothing).
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For PC you have to confirm the connection dialog that would show on the screen if it wasn't broken... at least for english language this button is in the center of the screen, 3cm from the bottom. On your reader that should be about near the "end of the river".
Touch might still work so if you need to copy your books off the device, experiment a little and PC connection might still be possible.