Same message
Happened to me once. Had new Kobo a couple of days.
I had a poorly formatted novel and was redoing the CSS in Sigil while deleting it in Calibre and on the Kobo, then reloading the corrected version in Calibre and on the Kobo. Needless to say I screwed something up and got the reset message. I ignored it and found even though I had deleted it from Kobo via Calibre and it no longer showed in library I was unable to side load it from Calibre and see it in library.
At this point I noticed a folder for the novel in the file browser(Dolphin), dragging it to the trash, disconnecting from the pc, powering the Kobo down, then reconnecting, I was able to side load from Calibre and see the corrected version in the Kobo library.
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