That looks like the stock recovery screen, and we have absolutely no way to trip that ourselves.
I'm guessing you forced a shutdown *during* the KOReader restart? (Which in itself is perfectly harmless, mind you).
In any case, if the recovery process doesn't actually do anything, it's probably dead storage. IIRC, the Clara has an internal SD card, so you *could* swap it yourself (get a new card and ask for an image in the proper thread in the Kobo dev forum). But, if you can, just RMA it.
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