This happens to me when I try to side load too many books at one time. I found I load about 5-10 books from Calibre eject, let the books load then repeat.
About a month after I got my Kobo, it didn't matter if I just sideloaded one book, it wouldn't process past 87%. I had to reset to factor settings that time and then side load all the books I wanted again. Since, then it has worked fine. Firmware upgrade 1.16 helped, I think we were on 1.15 or shortly after the 1.15 upgrade that I had issues.
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