Quote:
Originally Posted by n1kk00
A little something to consider regarding @Arnie97's experiment with not clearing the DBs under /var/local. I went this route when I was downgrading my wife's PW2 (on v5.7.4) the other day. It was ok initially. However, later when I tried to sideload a book it didn't show up on the home screen; it opened just fine in KOReader and on my PW2 so not a file issue. Figuring the only difference was that I didn't clear the DBs I thought I'd clear them now - did it and after a couple of reboots all was back to normal, sideloaded books would appear and all. So probably not a good idea to skip this step 
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Sideloaded books and other things happened to work well on my device, but your mileage may vary. Anyway, it's always a safer choice to reset the databases.