Clearly you had a bad file you can run chkdsk on your kobo. I'm not familiar with unlocker but when I have replaced the database I didn't have any trouble deleting files.
I would. Run inkling the kobo. Restart the kobo and the computer. Remount kobo , run chkdsk, delete all the files, then replace them as per the instructions. By taming.
Keep us posted on how it works
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