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Originally Posted by davidfor
It didn't work because the problem as you described it in no way matches the problem @Semwize has been talking about. One of them sort of does, but, that could be that particular book matches whatever it is that is triggering the problem @Semwize is reporting.
What is most likely is that the database on the device is corrupt. Your description of books missing, and reading locations not updating is usually caused by database problems. This is unlikely to have been caused by the update. It is probable that the database has been corrupted for a while, but, the restart needed during the firmware update means the database was reread. If you want to check, you can use my Kobo Utilities plugin in calibre to check the database. But, I expect that if you connect to calibre, you will get an error about the corrupt database when it tries to get the list of books on the device.
The fix for this, is to sign out of the Kobo account and back in again. This will create a fresh database and import the sideloaded books. It will mean you lose the reading status of the sideloaded books, but that will happen with a factory reset as well.
If you have a recent good backup of the database, restoring that should also work.
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Thanks. This should be easier to do.
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What firmware version were you running before? That sounds like the old tiled home screen. This a replace with the current home screen in firmware version 4.4. And that was released nearly two years ago.
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I was running a very old version. I bought the kobo aura about a year after it came out. Updated it at that point then turned off wifi and never looked back. Almost all my books are from drm-free purchases and loaded through calibre or dem ones through adobe digital editions. I was on holiday and wanted to load some pocket articles I had so I connected and forgot to turn it off so it auto-updated.