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It probably means that your eMMC is failing, so there is no longer a 100% working copy of Nickel (and since KOReader must be installed on the internal memory, it's also vulnerable). The normal solution would be to get a new SD card and put a fresh image on it, but for models that use eMMC, you'd have to do some serious surgery and soldering to replace the chip. Realistically, it's probably time to look at replacing your device.
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