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That nasty "error communicating with device" tortured me for awhile. There was nothing wrong with the database, it was just the combination of Calibre with my Kobo reader while on WinXP with an AMD processor. And it would happen on every single connection of the reader. I might be able to transfer 1 book at most once in awhile, anything else would then pop up the error. This started happening with firmware 2.5.x and was told pretty much nothing could be done, and it definitely wasn't Kobo's doing, they didn't change anything that would affect communication between PC and reader.
However I tried downgrading to firmware 2.4.0 and the problem completely disappeared on the same WinXP machine with an AMD processor. That's one of the main reasons I stuck with 2.4.0.
This summer I installed Windows 7 on 1 of my 3 PCs, the main one I use, when I upgraded the motherboard and CPU (still AMD), so the problem doesn't happen anymore even with new firmware. But I'm still convinced Kobo made some change, otherwise 2.4.0 wouldn't have worked perfectly.
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